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