Here is the full list of all 23 Afterparty achievements.
Beat Satan and earn your way back home.
Intentionally curse twenty times.
Make friends with Sam.
Make friends with Wormhorn.
Reunite Milo and Lola.
Play as Milo after fighting with Lola.
Get Apollyon's Seal of Approval.
Reunite Beth and Asmodeus.
Get Asmodeus's Seal of Approval.
Drink a lot of booze.
Waste 20 minutes on Bicker.
Pet the damn dog.
Try 20 different drink types.
Get an Invite to Satan's from Lynda.
Don't miss a step while dancing.
Kick off your adventure in Hell.
Get an Invite to Satan's from Fela.
Play as Lola after fighting with Milo.
Intentionally lose to Satan.
Fail to beat Satan.
Recruit the Drunk Idiot Demon for Satan's final challenge.
Play a perfect game of beer pong.
Play a perfect stacking game.