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