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