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