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