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