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