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