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