Here is the full list of all 45 Scars Above achievements.
Completed the game.
Defeated the Omega and the Custodian.
Discovered Naya's fate.
Kept an enemy within the Gravity Trap for its whole duration.
Crafted a weapon upgrade for all weapons.
Scanned all hostile creatures.
Unlocked all abilities.
Activated all pillars.
Crafted all weapons.
Ignited multiple enemies with a single Flammable Liquid charge.
Crafted all gadgets.
Defeated the Neuro-parasite.
Defeated the Feliform Cadaver.
Learned of Kate's special status.
Scanned all available unique natural resources.
Solved all puzzles.
Learned of the mysterious code hidden in genes.
Unlocked a tier 4 ability.
Defeated the Construct.
Found the crashed remains of the Hermes.
Killed an enemy while it was affected by the Holo-lure.
Found Mr. Jefferson.
Reached the Grassy Plains.
Discovered Robinsons' transformation into the Alluvial King and had to kill him.
Used the shield to deflect incoming damage that would have killed you.
Activated 5 pillars.
Crafted a weapon upgrade.
Solved the Alien Console puzzle.
Crafted the first gadget.
Crafted all consumables.
Defeated the Alpha.
Used the pulse scan to reveal an enemy weak point.
Killed an enemy while it was in the frozen state.
Investigated the area around Richard's backpack and figured out where he went.
Unlocked the first ability.
Crafted the first consumable.
Used the Mobile Printing Unit to craft the Thermic Charger.
VERA assembled.
Discovered the Metahedron vista.
Weathered the mysterious storm.
Activated your first pillar.
Scanned first natural resource.
Scanned the first hostile creature.
Scanned a Knowledge Cube.
Caused an elemental reaction.