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