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