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