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