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