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