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