Here is the full list of all 45 RUNNING WITH RIFLES achievements.
100.000 bullets shot
Win the Greycollars campaign
Win the Brownpants campaign
Destroy 5 prison bus/doors
Stab 10, kill 50 with a suppressed weapon and spot 15 strategical enemy structures
Destroy 10 special crates and deliver 8 secret cargo vehicles
Roadkill 100 soldiers
Died 500 times
Kill 500 enemies with blast projectiles
Unlock 10 enemy weapons
Win the Greenbelts campaign
Destroyed the Darkcat tank
Destroy 5 special crates and deliver 4 secret cargo vehicles
Stab 5, kill 20 with a suppressed weapon and spot 7 strategical enemy structures
50.000 bullets shot
Destroy 3 prison bus/doors
Heal 10 wounded soldiers
Unlock 5 enemy weapons
Destroy 2 special crates and deliver 2 secret cargo vehicles
Heal 5 wounded soldiers
Destroy 10 enemy structures and 2 communication structures
Destroy 1 anti-air structure
Stab 2, kill 10 with a suppressed weapon and spot 2 strategical enemy structures
Destroy 5 enemy structures and 1 communication structure
Roadkill 20 soldiers
Died 200 times
Kill 200 enemies with blast projectiles
Kill 10 elite soldiers
Heal 1 wounded soldier
Kill 1000 enemy soldiers
10.000 bullets shot
Destroy 20 enemy vehicles
Destroy 2 enemy structures
Destroy first prison bus/door
Roadkill 5 soldiers
Died 100 times
Destroy 10 enemy vehicles
Unlock the first enemy weapon
Kill 100 enemies with blast projectiles
Kill 500 enemy soldiers
Kill 5 elite soldiers
Destroy 5 enemy vehicles
Win your first map of the campaign
Kill first elite soldier
Kill 100 enemy soldiers