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