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