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