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