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