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