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.
Incapacitate 25 enemies with dodge counter.
Complete all conversations with the Endurance crew.
Kill 2 multiplayer enemies with a single explosive.
Rope pull 5 enemies off edges.
Shoot 10 enemies off zip lines.
Complete a match in all multiplayer modes.
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.
Catch a player in a snare trap in multiplayer.
Kill 10 multiplayer enemies using your melee attack.
Kill a zip-lining enemy player in multiplayer.
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.
Revive a teammate in a multiplayer match.
Find all documents, relics and GPS caches.
Complete the game.
Purchase all skills in all categories.
Force an enemy to drop dynamite that kills two people when exploding.
Complete all challenges.
Fully mod and completely upgrade all weapons.
Fully mod and completely upgrade any weapon.
Complete all optional tombs.
Find 75% of all documents.
Loot 200 enemies.
Kill 40 enemies with the shotgun.
Collect 75% of all relics.
Find 75% of GPS caches.
Kill and loot 10 flying animals (crows and gulls).
Kill FeeFee the crab.
Purchase all skills in one category.
Kill 25 unaware enemies.
Kill 50 enemies with the bow.
Shoot a bundle of dynamite out of the air.
Kill 75 enemies with the rifle.
Collect 5000 pieces of salvage.
Find 25% of GPS caches.
Perform 15 finishers.
Kill and loot 10 small animals (rabbits, chickens, rats).
Collect 25% of all relics.
Perform 50 headshot kills in the single player campaign.
Kill 35 enemies with the pistol.
Find 25% of all documents.
Complete one optional tomb.
Complete one challenge.
Kill and loot 10 large animals (deer, boar, wolves).