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