Here is the full list of all 38 Freeman: Guerrilla Warfare achievements.
Forge 5 alliances with other nations
Defend your city 5 times
Win 50 battles
Land 1000 headshots
Kill 1000 enemies in total
Construct 50 buildings
Accept volunteer troops 5 times
Die 50 times
Lose 50 battles
Throw 200 grenades
Steal 50 times
Have -200 Reputation
Plunder 50 times
Have -100 Reputation
Fail at stealing 50 times
Have -30 Reputation
Recruit all available companions
Reach 300 Reputation
Reach 500 Reputation
Kill 100 enemies with submachine gun
Reach Level 30
Kill 100 enemies with shotgun
Kill 100 enemies with pistol
Kill 100 enemies with grenades
Forge 3 alliances with other nations
Fully upgrade your Stealing skill
Fully upgrade your Agility skill
Land 100 headshots
Kill 100 enemies in total
Win 10 battles by yourself
Reach 50 Reputation
Reach Level 10
Reach Level 5
Fully upgrade your Medicine skill
Fully upgrade your Intelligence skill
Possess 1,000,000 Zolties
Possess 5,000,000 Zolties
Possess 100,000 Zolties