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.
Win a ranked match in every multiplayer mode.
Complete the game.
Find all documents, relics and GPS caches.
Fully mod and completely upgrade all weapons.
Purchase all skills in all categories.
Complete all challenges.
Complete all optional tombs.
Complete all conversations with the Endurance crew.
Find 75% of all documents.
Collect 75% of all relics.
Find 75% of GPS caches.
Fully mod and completely upgrade any weapon.
Incapacitate 25 enemies with dodge counter.
Kill FeeFee the crab.
Buy every upgrade and character in multiplayer.
Reach level 60 in multiplayer.
Purchase a new multiplayer character.
Shoot 10 enemies off zip lines.
Kill and loot 10 flying animals (crows and gulls).
Loot 200 enemies.
Kill 75 enemies with the rifle.
Kill 25 unaware enemies.
Purchase all skills in one category.
Force an enemy to drop dynamite that kills two people when exploding.
Kill 50 enemies with the bow.
Shoot a bundle of dynamite out of the air.
Kill 40 enemies with the shotgun.
Collect 5000 pieces of salvage.
Rope pull 5 enemies off edges.
Perform 15 finishers.
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 10 multiplayer enemies using your melee attack.
Catch a player in a snare trap in multiplayer.
Kill a zip-lining enemy player in multiplayer.
In multiplayer, escape death 3 times by using the rope ascender.
Kill 20 enemy players in multiplayer using a turret.
Find 25% of GPS caches.
Collect 25% of all relics.
Find 25% of all documents.
Kill 35 enemies with the pistol.
Perform 50 headshot kills in the single player campaign.
Reach level 10 in multiplayer.
Survive 10 explosions in multiplayer.
Complete a match in all multiplayer modes.
Complete one challenge.
Complete one optional tomb.
Kill and loot 10 large animals (deer, boar, wolves).
Kill and loot 10 small animals (rabbits, chickens, rats).