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