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