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