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