Here is the full list of all 50 Tomb Raider achievements. It takes around 40-50 hours to unlock all of the achievements on Windows.
Purchase all skills in all categories.
Complete all conversations with the Endurance crew.
Kill 35 enemies with the pistol.
Find 75% of all documents.
Kill 75 enemies with the rifle.
Shoot a bundle of dynamite out of the air.
Fully mod and completely upgrade any weapon.
Find 75% of GPS caches.
Collect 75% of all relics.
Kill FeeFee the crab.
Kill and loot 10 flying animals (crows and gulls).
Loot 200 enemies.
Kill 25 unaware enemies.
Perform 50 headshot kills in the single player campaign.
Perform 15 finishers.
Force an enemy to drop dynamite that kills two people when exploding.
Purchase all skills in one category.
Collect 5000 pieces of salvage.
Find 25% of GPS caches.
Collect 25% of all relics.
Kill 50 enemies with the bow.
Find 25% of all documents.
Kill and loot 10 small animals (rabbits, chickens, rats).
Complete one challenge.
Kill and loot 10 large animals (deer, boar, wolves).
Complete one optional tomb.
In multiplayer, escape death 3 times by using the rope ascender.
Revive a teammate in a multiplayer match.
Purchase a new multiplayer character.
Reach level 10 in multiplayer.
Catch a player in a snare trap in multiplayer.
In multiplayer, be the only player on your team that isn't dead or downed.
Find all documents, relics and GPS caches.
Fully mod and completely upgrade all weapons.
Kill 40 enemies with the shotgun.
Rope pull 5 enemies off edges.
Shoot 10 enemies off zip lines.
Incapacitate 25 enemies with dodge counter.
Complete all optional tombs.
Complete all challenges.
Complete the game.
Complete a match in all multiplayer modes.
Kill 20 enemy players in multiplayer using a turret.
Kill a zip-lining enemy player in multiplayer.
Survive 10 explosions in multiplayer.
Win a ranked match in every multiplayer mode.
Kill 10 multiplayer enemies using your melee attack.
Kill 2 multiplayer enemies with a single explosive.
Buy every upgrade and character in multiplayer.
Reach level 60 in multiplayer.