Here is the full list of all 51 Door Kickers: Action Squad achievements. It takes around 15-20 hours to unlock all of the achievements on Windows.
Collect all 20 secret items
Kill 3 enemies by blowing up one barrel
Blow Open 100 Doors
Use sniper support to kill 1000 enemies
Use 5 extra lives in the same mission
Resurrect another player 5 times in the same mission
Kill 3 enemies with one breaching charge
Disarm 30 bombs
Get 100 kills as Assaulter
Rescue 1000 hostages
Successfully complete all missions in Chapter 5
3-Star all missions in Chapter 5
Rescue 50 Wounded Policemen
Make 5 VIP Arrests
Get 100 kills as Shield
Use sniper support to kill 100 enemies
Unlock Chapter 5
Successfully complete all missions in Chapter 4
3-Star all missions in Chapter 4
Kick Open 1000 Doors
Get 100 kills as Recon
Unlock Chapter 4
3-Star all missions in Chapter 3
Successfully complete all missions in Chapter 3
Get 100 kills as Agent Fergie
Stun 500 enemies
Kill yourself with your own explosives
Unlock Chapter 3
Successfully complete all missions in Chapter 2
3-Star all missions in Chapter 2
Unlock Chapter 2
Successfully complete all missions in Chapter 1
3-Star all missions in Chapter 1
Kill 1000 bad guys
Kill 50 Hostages
Kill an enemy with an elevator
Get 100 kills as Breacher
Kick Open 100 Doors
Set 20 enemies on fire
Rescue 50 hostages
Collect your first secret item
Kill 50 bad guys
Get 3 stars in a mission
Win one mission in Coop
Complete a level without taking any damage whatsoever