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.
Complete all conversations with the Endurance crew.
Buy every upgrade and character in multiplayer.
Reach level 60 in multiplayer.
Shoot a bundle of dynamite out of the air.
Win a ranked match in every multiplayer mode.
Rope pull 5 enemies off edges.
Complete a match in all multiplayer modes.
Revive a teammate in a multiplayer match.
Kill 20 enemy players in multiplayer using a turret.
Kill a zip-lining enemy player in multiplayer.
Shoot 10 enemies off zip lines.
Incapacitate 25 enemies with dodge counter.
Find all documents, relics and GPS caches.
Complete the game.
Kill 10 multiplayer enemies using your melee attack.
Purchase all skills in all categories.
Fully mod and completely upgrade all weapons.
Kill 40 enemies with the shotgun.
Complete all challenges.
Complete all optional tombs.
Find 75% of all documents.
Fully mod and completely upgrade any weapon.
Collect 75% of all relics.
Find 75% of GPS caches.
Kill FeeFee the crab.
Purchase all skills in one category.
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.
Loot 200 enemies.
Perform 15 finishers.
Kill 25 unaware enemies.
Kill 35 enemies with the pistol.
Collect 5000 pieces of salvage.
Perform 50 headshot kills in the single player campaign.
Survive 10 explosions in multiplayer.
In multiplayer, escape death 3 times by using the rope ascender.
Find 25% of GPS caches.
Collect 25% of all relics.
Kill 2 multiplayer enemies with a single explosive.
Reach level 10 in multiplayer.
Catch a player in a snare trap in multiplayer.
Kill 50 enemies with the bow.
In multiplayer, be the only player on your team that isn't dead or downed.
Purchase a new multiplayer character.
Kill and loot 10 small animals (rabbits, chickens, rats).
Find 25% of all documents.
Complete one optional tomb.
Complete one challenge.
Kill and loot 10 large animals (deer, boar, wolves).