Day 2 encompasses a full 24 hours, from Friday midnight to Saturday midnight. If you wrapped everything up as suggested on the first day you're in good shape, just make sure you're present in the security room at 6 AM to kick things off.
The first case starts at 6 AM, you should be waiting in the security room for the cutscene. Once the cut is over head into the mall toward Entrance Plaza, the gate will be up and you'll get another cut when you enter; after you have control back you'll fight Carlito again. I generally hang around Shootingstar Sporting Goods (On the second level, just before the hallway corner) just out of sight. Carlito and Brad will shoot at each other for a bit, then eventually Carlito will come over and you can wack him a few times with a chainsaw to end the fight, leading to a cutscene where Brad gets shot. In the Security Room Jessie will ask you to get medicine for him, so you're off to the Grocery store to find it.
Before leaving the Security Room, get a picture of Jessie, she'll be sitting on the bed by Brad in the perfect position to get a 1000+ PP picture you'll be needing in a little bit. Back up against the door and zoom in a bit to get her in frame, keep snapping/zooming adjusting until you get above 1000PP, you'll feel a little pervy, but you WILL need this in a couple hours!
With sexual harassment complete, go to North Plaza and enter Seon's, Otis will call to tell you where to find the pharmacy entrance and another cut will trigger when you touch the door. You'll need to fight Steven to get the key, this isn't a hard fight but you do need to avoid his cart and shotgun, so getting into chainsaw range can be tricky. Once he's dead, enter the pharmacy and grab the first aid kit, then head to Wonderland Plaza.
In Wonderland go up the stairs to the right, and into the shoe store just past the Space Rider (where you fought Adam), Run Like the Wind. In the back you'll find Tonya and Ross; Ross will ask for a gun but if you give him one he'll shoot himself and Tonya will refuse to join. Talk to them a little and they'll both agree to join, you'll need to carry Ross as he can't walk but Tonya will accept a weapon. Run them back to the security room and talk to Jessie, there will be no cutscene, but this will finish the case, leaving you free for a couple hours, but don't go far, you need to be back by 11 AM.
Back in Paradise Plaza, you'll hear someone crying for help. Heather is in the water in front of the toy store Child's Play, across the hall just to your right, getting swarmed, so If you've got a queen on hand this is the time to use it. Clear the undead and talk to her, she'll join, then head inside the store to find her sister, Pamela, by the till; talk to Pamela and she'll join as well, run them both up to the security room.
Head back down and run over to Al Fresca plaza, it'll be a quick run as the gates are all open, however the plaza is generally choked with undead, so be careful. Head to McHandy's Hardware, next to the food court entrance, across from the gym, and go behind the counter to find Gordon; Gordon will take a bit of work to get moving (including slapping him around a bit) but will eventually join. Give him a gun and head back to Entrance Plaza and up to the security room. If everything goes right you should be there in time for the next case, so just watch the cutscene and you're done until 3PM. Head back to Colombian Roastmasters, in Paradise Plaza, and grab a pie off the counter before going to Jill's Sandwiches, beside the Leisure Park doors, (you'll need to smash your way in as the doors are barricaded) where you'll find Ronald behind the counter looking for food. Talk to Ronald, then give him the pie you're carrying and he'll agree to join, run him up to the security room and head back down for another psycho encounter.
In Paradise Plaza head to Colombian Roastmasters to talk to Kent, show him your best picture of Jessie (you'll need to manually select it from your camera so make sure you show the right one), he'll get mad and issue another challenge, then leave you alone to head to the North Plaza.
In North Plaza go into Crislip's, immediately to your right when you enter, and fight Cliff. Cliff is fast and has some explosives, but stay out of his reach and wack him with your chainsaw a couple times, he'll die fast enough (if you've been following my instructions this will give you the Peace Keeper achievement). Once he's down you'll get the key for the empty store next door; head over and free the 3 people inside, they'll join when you talk to them (grab the Survival book in here, it gives a 100% buff to food items and saves a lot of inventory space). Head out the door and across the park, when you enter Paradise Plaza a cutscene with the Raincoat Cultists locking a girl in a box will trigger. When you have control back kill the cultists and help Jennifer out of the box, once freed she'll join and you can take everyone back to the security room. When you get back it should be time for the next case, so save up and head back to the North Plaza for a fight with Isabella.
The Isabella fight isn't hard, but she moves quick and can be hard to hit so you'll have a little work to do. I tend to stick by the construction near the center of the plaza and run out to hit her when she slams up against something.
With Isabella taken care of you're free until midnight, so head over to Wonderland for the next psycho fight. When you enter the plaza head up the stairs to the left and run to the clothing store, Lovely Fashion House, at the end of the walkway; entering the store triggers a disturbing cutscene, after which you'll fight Jo. This fight should be quick, Jo doesn't stand up to a lot of punishment, but be careful not to hit the hostages or let Jo torture them, she'll kill them if she has a chance. With Jo dead you'll get the handcuff key and be able to release the hostages, all of which will join as they're freed. Exiting the store, run down the stairs to your left and head to the playground, you'll see two people dangling from the giant rabbit, Nick and Sally, with crowds of zombies trying to get them; clear out the crowds (there should be a couple queens hanging around specifically for this purpose) then throw something at the people to knock them to the ground, once you talk to them they'll join up. This is the single biggest group I'm recommending you escort, so arm anyone willing, but not many will accept a weapon in this group.
After leaving the security room head to Columbian Roastmaster's and pick up a pie (don't eat it, just carry it) then head to Entrance Plaza for a triple psycho fight. The three snipers are more of a pain in the ass than an actual threat, they'll shoot you a couple times until you close on them, then try to run away; chase them down and wack 'em with your saw to finish things up. Get down to the main floor and head for the kids clothing store on the right side, Gramma's Kids, to find Jolie crying inside, she'll refuse to leave without her friend, but as soon as you walk out of the store she'll be too scared to stay alone and will join. Run back upstairs to the women's clothing store on the left hand side, Ladies' Space, to find Rachel; Rachel will refuse to talk to you unless Jolie is there, but once they see each other you can talk to Rachel and she'll join. Staying on the upper level, cross over to the antique store, Ned's Knicknackery, and talk to Floyd; he'll take some convincing, but will eventually agree to join (you'll need to carry him, but at least you won't lose him). Finally, run to the cosmetics shop by the escalator, Estelle's Fine-lady Cosmetics, you'll find Wayne hiding near the till, tell him the snipers are dead, he'll hit on Frank, then join and accept a weapon. Run everyone back to the security room and save up, you're ostensibly free till midnight.
Depending on the speed you're moving at you should be nearby the Security Room when Otis calls to tell you that Ronald is making trouble, head back and talk to him, he'll demand more food so give him the pie you've been carrying. Once he's eaten he''ll settle down and you can forget about him. You should wrap this up well before midnight to be safe, but that shouldn't be a problem.
You've put a stop to 9 psycho's by now (the convicts do not count toward any psycho related achievements, nor do the cultists you've been slaughtering wholesale) and Punisher will come very early tomorrow. If you're still wanting PP Collector , Gourmet, and Clothes Horse this is a good time to get them in the bag. Here's a list of the photo ops , the foods, the outfits you'll need for their respective achievements.