Here is the full list of all 26 SUPERHOT achievements. It takes around 20-25 hours to unlock all of the achievements on Windows.
Launch every app in the system.
Become part of the community.
Get back to the system after being expelled.
Kill over 1987 Red Dudes in endless mode.
Unlock all endless levels.
Get RED ending in every level of SPEEDRUNrt challenge.
Get RED ending in every level of SPEEDRUN challenge.
Kill 3 Red Dudes with one shotgun shot.
Kill 100 Red Dudes with a shotgun.
Upload a replay on killstagram.com
Kill 100 Red Dudes with a rifle.
Beat all Challenges.
Kill 2 Red Dudes with one katana throw.
Cut bullet with a katana.
Score 100 headshots.
Complete SUBWAY level.
Find all secrets.
Kill 100 Red Dudes with a katana.
Kill 100 Red Dudes using melee.
Complete the game.
Kill 3 Red Dudes with one rifle burst.
Kill 100 Red Dudes with a pistol.
Kill an enemy by jumping on him.
Complete SERV level.
Shoot down a bullet with a bullet.