Here is the full list of all 30 LiEat achievements. It takes around 5-6 hours to unlock all of the achievements on Windows.
Poke Efi Three Times While Sleeping
Fight the "I'm not drunk!" Lie
Fight the Girlfriend Lie
Find out about Hal's Cracked Phone
Fight Three Blue Rats
Bad Ending, Lose to William
Steal the Money from the Bookshelf
Rest Two Times in a Row
Defeat a Red Moth
Get Bad Ending from Wolf Encounter
Play Liar (music track) at the Slowest Speed in Post-game
Find the Funny Glasses
Neutral Ending
Good Ending
Pair up with Brett
Pair up with Iris
Bad Ending
Pair up with Neil
Sleep in the Bed During the Maid Investigation
Find the Legendary Knife and Cookie
Have Iris Analyze You
Find the Cherry Candy in the Trash
Eat 15 Cookies
Finish LiEat 1
Get Efi to Level 10
Steal the Candy from Keith and Rachel's House
Find Big Liar Equipment
Put Panties on your Head
Get Bad Ending from Losing Boss Battle