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