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