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