Here is the full list of all 57 HAAK achievements.
The base game contains 53 achievements, and there are 2 DLC packs containing 4 achievements.
Change the color of your cape once.
Squeezed to death
Fuse a HP slot
Found 10 Mystic Disks
Complete [Pass the Tunnel]
Spend less than 8 minutes to escape from Metro Tunnel
Dropped into the acid pool 10 times
Complete [Road to the South]
Use a Bathroom Portal once.
Smashed 10 Big Chests
Bitten to death by dogs 3 times
Complete [North Station]
Electrocuted 10 times
Complete [Escape from Ruins]
Enter World Map
Defeat Wang Ping in Sanhe Ruins within 3 minutes
Defeat Wang Ping in Sanhe Ruins
Destroy 100 bricks
Found a hidden item
Found a Mystic Disk
Obtain a Power Glove
Dropped into the pit of Sanhe Ruins
Thoroughly search North Station
Stay in North Station for more than 2 hours
Kill 18 Laser Drones
Pass through the heavily guarded pathway in the [Brewery] without shutting any of the 4 doors blocking the sight.
Fuse 5 HP slots
Fuse 1 EP slot.
Find 30 Mysterious Disks.
Find 50 Mysterious Disks.
Defeated 3Kyo without getting damaged.
Solved the maze in Momoyama.
Destroy all 4 signal towers.
Become a puppet of GAEL.
Brings hope to Good-Hearted Fort.
Achieve 100% exploration.
Obtain 4000+ Tongbao in total.
No death until beating Fatty.
Editor-in-chief Ben Dover thought you're really good.
Someone can actually beat the game in 5 hours, wow!