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