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