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