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