Here is the full list of all 121 The Madness of Little Emma achievements.
Unlock fifth ending
Get very unlucky
Unlock Chloe
Complete Arena as Emma
Complete Arena
Unlock final ending
Kill all bosses in episode 4
Unlock Marah
Unlock third ending
Unlock sixth ending
Kill April
Get very lucky
Unlock second ending
Kill all bosses in episode 3
Kill Meat Bag
Kill Autumn
Kill 4 Seasons
Find a red chest
Kill Eidolon
Reach The Riddle
Kill Spring
Kill Summer
Kill Winter
Unlock first ending
Kill Manless Face
Get really insane!
Buy 5 items in one playthrough
Kill Sinister Mask
Kill all bosses in episode 2
Kill Red Viper
Unlock Amelia
Kill a shopkeeper
Kill Entozoon
Destroy a turnip
Kill all bosses in episode 1
Unlock Lucretia
Reach Misery
Kill the fat man
Kill Alice
Find a secret
Have only 1 heart container
Collect 5 health bonuses in one game
Find Love Burrow
Reach Undergrounds
Reach Den
Unlock Elizabeth
Kill Liquid Sisters
Kill Haunt
Kill Green Viper
Kill a boss
Kill Mask
Die
Find everything
Complete ending 4 with clean mind all the time
Unlock every other achievement
Complete episode 1 without collecting hearts and healing herbs
Complete episode 2 without collecting hearts and healing herbs
Complete episode 3 without collecting hearts and healing herbs
Complete episode 4 without collecting hearts and healing herbs
Kill Spirit
Find all Love Items
Kill Manless Face as Amelia
Complete Arena as Lucretia
Complete Arena as Elizabeth
Complete Arena as Amelia
Complete Arena as Marah
Complete Arena as Chloe