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