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