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