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