Here is the full list of all 121 The Madness of Little Emma achievements.
Kill a shopkeeper
Complete Arena as Elizabeth
Unlock Chloe
Complete Arena
Get very lucky
Kill Spring
Kill 4 Seasons
Reach The Riddle
Buy 5 items in one playthrough
Kill Sinister Mask
Kill all bosses in episode 3
Get very unlucky
Kill Winter
Kill Summer
Unlock Amelia
Kill Autumn
Unlock Elizabeth
Unlock first ending
Kill Manless Face
Kill Meat Bag
Get really insane!
Have only 1 heart container
Reach Misery
Kill Entozoon
Kill all bosses in episode 2
Unlock Lucretia
Kill all bosses in episode 1
Kill the fat man
Find a red chest
Kill Liquid Sisters
Collect 5 health bonuses in one game
Reach Undergrounds
Find Love Burrow
Kill Red Viper
Kill Alice
Reach Den
Kill Haunt
Kill Green Viper
Destroy a turnip
Die
Find a secret
Kill a boss
Kill Mask
Unlock second ending
Unlock third ending
Unlock final ending
Kill all bosses in episode 4
Kill April
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 Eidolon
Kill Spirit
Find all Love Items
Unlock fifth ending
Unlock sixth ending
Kill Manless Face as Amelia
Unlock Marah
Complete Arena as Emma
Complete Arena as Lucretia
Complete Arena as Amelia
Complete Arena as Marah
Complete Arena as Chloe