Here is the full list of all 27 FoolHut Pack - there are 3 games in 1 achievements.
Defeat the final demon.
Take down 500 demons in one game.
Reach the maximum amount of upgrades
Beat Red Handsome Loop.
Score 2000 points in Red Handsome Loop's endless mode.
Defeat Red Handsome Loop's fourth boss.
Defeat Red Handsome Loop's third boss.
Defeat Red Handsome Loop's second boss.
Unlock YDPPPRHL.
Defeat Red Handsome Loop's first boss.
Complete Red Handsome Loop's tutorial.
Beat PuPaiPo Space 3D DX
Power through PuPaiPo's sixth stage.
Cross through PuPaiPo's fifth stage.
Swim through PuPaiPo's fourth stage.
Slide through PuPaiPo's third stage.
Rock through PuPaiPo's second stage.
Blast through PuPaiPo's first stage.
Change palettes in the settings menu.
Complete a procedural Picomancer level.
Complete all Picomancer levels.
Complete 10 Picomancer levels.
Step on 100 Picomancer tiles.
Defeat the Picomancer in any level.
...but a Picomancer revived you 10 times!
You died... but a Picomancer revived you!
Check the achievements menu.