Here is the full list of all 34 Heavy Fire: Shattered Spear achievements.
Fire 25,000 rounds of ammunition.
Kill 250 enemies with a pistol.
Complete a level without causing any destruction.
Find and destroy 100% of special objects.
Complete all missions in Veteran Mode.
Complete the last mission on Veteran Mode without using checkpoints.
Achieve 100% sniper accuracy.
Find and destroy 75% of special objects.
Destroy 500 objects in total.
Find and destroy 50% of special objects.
Complete the 12th mission.
Complete all missions in Rookie Mode.
Complete any mission without being hit.
Complete the 10th mission.
Complete the 8th mission.
Complete the 7th mission.
Score 1,000 total kills.
Destroy 200 objects in total.
Kill 500 enemies with an additional/special weapon.
Perform 100 headshots in total.
Complete the 5th mission.
Score 500 total kills.
Complete the 3rd mission.
Score 250 total kills.
Perform 5 splash damage kills simultaneously.
Perform 50 headshots in total.
Complete the 2nd mission.
Chain together 7 consecutive kills.
Chain together 5 consecutive kills.
Perform 4 splash damage kills simultaneously.
Complete any mission with 50% accuracy or higher.
Perform a QTE perfectly in one level.
Destroy all red barrels in one level.
Perform 5 headshots in a row.