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