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