The EPISODE 5 Add-on for Muffles' Life Sentence has 14 achievements.
Find where the rubber duck is hiding.
Open all stashes in Episode 5.
Find all memories in Episode 5.
Increase your max MP to 4.
Defeat every Nightmare fight.
Get Derek's face.
Get Scarlet's piece of Deesus.
Get Norah's piece of Deesus.
Get Botchy/Nil's piece of Deesus.
Deesus has risen.
Finish Episode 5.
Get the secret ending.
Open every stash.
Find every memory.