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