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