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