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