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