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.
Beat all Challenges.
Get RED ending in every level of SPEEDRUN challenge.
Become part of the community.
Cut bullet with a katana.
Kill 100 Red Dudes with a rifle.
Kill 100 Red Dudes with a shotgun.
Complete the game.
Kill 100 Red Dudes with a katana.
Get back to the system after being expelled.
Upload a replay on killstagram.com
Kill 2 Red Dudes with one katana throw.
Kill 100 Red Dudes using melee.
Complete SERV level.
Score 100 headshots.
Kill 100 Red Dudes with a pistol.
Kill an enemy by jumping on him.
Shoot down a bullet with a bullet.
Complete SUBWAY level.
Kill over 1987 Red Dudes in endless mode.
Kill 3 Red Dudes with one shotgun shot.
Kill 3 Red Dudes with one rifle burst.
Unlock all endless levels.
Find all secrets.
Get RED ending in every level of SPEEDRUNrt challenge.