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