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