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