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