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