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