Here is the full list of all 43 Door Kickers achievements. It takes around 25-30 hours to unlock all of the achievements on Windows.
Kill 10 bad guys within 5 seconds, without letting them fire a shot.
Kill 1000 enemies.
Unlock all playable classes
Have your entire team killed at roughly the same time after unpausing the game, within seconds of mission start.
Defuse your first bomb
Unlock the Breacher class
Get 50 stars
Unlock the Shield Class
Hit 5 enemies with the same Flashbang.
Get your first One Man Army Medal
Complete 10 missions
Unlock the Assaulter class
Get 13 stars
Get a 3 star result as an "improved result" on a mission
Save your first hostage
Get your first Perfect Plan Medal
Get your first No Pause Medal
Complete 150 missions.
Arrest 100 enemies.
Breach 400 doors.
Fire a total of 10000 rounds.
Walk total 10000 meters.
Get one star in every Single Mission.
Get two stars in every Single Mission.
Get three stars in all Single Missions.
Get 30 Perfect Plan Medals.
Get 30 One Man Army Medals.
Get 30 No Pause Medals.
Defuse a bomb with less then 1 second left.
Fully complete campaign "A Hard Day's Work"
Fully complete campaign "Drug Bust"
Fully complete campaign "The Cell"
Win a campaign in Iron Man Mode.
Level-up your squad to maximum level.
Level-up a trooper to maximum level.
Have a squad of fully leveled up troopers.
Unlock all equipment / weapons.
Complete a mission arresting 6 or more bad guys and without killing any.
Defuse 100 bombs.
Have a shield unit kill three enemies without moving.
Fully complete campaign "Terror at Sea"
Fully complete campaign "Suits and Ski-Masks"
Handcuff your first bad guy