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