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.
Perform 5 headshots in a row.
Complete the last mission on Veteran Mode without using checkpoints.
Find and destroy 100% of special objects.
Find and destroy 75% of special objects.
Find and destroy 50% of special objects.
Complete a level without causing any destruction.
Complete all missions in Veteran Mode.
Achieve 100% sniper accuracy.
Destroy 500 objects in total.
Chain together 7 consecutive kills.
Perform 100 headshots in total.
Complete the 12th mission.
Complete all missions in Rookie Mode.
Complete any mission without being hit.
Kill 500 enemies with an additional/special weapon.
Score 1,000 total kills.
Complete the 10th mission.
Complete the 8th mission.
Perform 50 headshots in total.
Destroy 200 objects in total.
Complete the 7th mission.
Score 500 total kills.
Complete the 5th mission.
Complete the 3rd mission.
Score 250 total kills.
Complete the 2nd mission.
Perform 4 splash damage kills simultaneously.
Perform 5 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.