Here is the full list of all 79 Broken Lines achievements.
End the campaign and walk home over the mountains
End the campaign and blow up the dam
Complete the level “Consequence”
Buy the best submachine gun: Sturmgewehr
Sacrifice a soldier to blow up the dam
Complete the level “Retribution”
Destroy a tank
Encounter the maskless enemies
Buy the best rifle: Mosin-Nagant Scoped Rifle
Complete the level “Worry”
Buy the best shotgun: Browning Automatic 5
Conner and Hailey talk about her scar
Complete the level “Power”
Find a crate with explosives
Complete the level “Contact”
Unmask an enemy
Complete the level “Strength”
Kill 101 enemies
Complete the level “Decency”
Fry and Hailey start fighting
Complete the level “Survival”
Unlock a second Trait on a Soldier
Complete the level “Clarity”
Buy a weapon from Izkor
Complete the level “Release”
Release Fry from Prison
Kill an enemy officer
Have all your soldiers panic at the same time
Restart a level
Complete the level “Uncertainty”
Gain a gold medal from a mission
Complete the level “Wreck”
Introduce yourself to the locals
Experience Lieutenant Brooks final words
Encounter the blocked mountain pass
Blow up the radio tower
Warn the civilians about the upcoming flooding
Find petroleum
Complete the level “Certainty”
Complete the level “Revenge”
Complete the level “Cruelty”
Complete the level “Greed”
Complete the level “Mischief”
Complete the level “Evasion”
Complete the level “Recoil”
Complete the level “Spirit”
Complete the level “Ambush”
Complete all levels in the entire game over several playthroughs
Complete Contact level in less than 4 minutes and 4 seconds
Complete Retribution level in less than 4 minutes and 12 seconds
Lose a campaign
End the campaign and get successfully extracted by a plane
End the campaign and drive away over the mountains
End the campaign and get surrounded and killed by vengeful enemies
End the campaign and get surrounded and killed by angry civilians
Experience all possible endings in the game
Conner rejects Avery’s advances
Wood and Hailey find the dog
Avery finds out about Wood’s fling
King and Sherman have a confrontation
Morgan opens up to Conner
Eat Izkor’s stew
Buy the fake grenade
Complete the campaign and never buy anything from Izkor’s shop
Cause 10 civilian casualties
Have a soldier desert your squad
Complete the campaign with 4 dead soldiers
Own 0 supplies and 0 salvage
Own more than 100 salvage
Find more than 10 supply crates in various levels during the same campaign
Kill three enemies with one grenade
Kill 5 or more enemy soldiers in a single turn
Equip a soldier with 3 abilities, 3 traits, and all equipment slots
Get your squad killed in Ambush!
Kill all enemies in the ambush in the level Ambush!
Fail a boot camp level
Complete all boot camp levels
Use Suppression 100 times
Kill an enemy after knocking them down 3 times