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