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.
Win a ranked match in every multiplayer mode.
Buy every upgrade and character in multiplayer.
Reach level 60 in multiplayer.
Kill 20 enemy players in multiplayer using a turret.
Kill a zip-lining enemy player in multiplayer.
Find all documents, relics and GPS caches.
Fully mod and completely upgrade all weapons.
Complete all challenges.
Purchase all skills in all categories.
Complete the game.
Fully mod and completely upgrade any weapon.
Find 75% of GPS caches.
Complete all optional tombs.
Find 75% of all documents.
Complete all conversations with the Endurance crew.
Loot 200 enemies.
Kill 40 enemies with the shotgun.
Collect 75% of all relics.
Kill FeeFee the crab.
Kill 75 enemies with the rifle.
Purchase all skills in one category.
Kill 25 unaware enemies.
Collect 5000 pieces of salvage.
Incapacitate 25 enemies with dodge counter.
Shoot 10 enemies off zip lines.
Rope pull 5 enemies off edges.
Force an enemy to drop dynamite that kills two people when exploding.
Shoot a bundle of dynamite out of the air.
Kill and loot 10 flying animals (crows and gulls).
Find 25% of GPS caches.
Kill 35 enemies with the pistol.
Kill 50 enemies with the bow.
Collect 25% of all relics.
Perform 50 headshot kills in the single player campaign.
Find 25% of all documents.
Perform 15 finishers.
Complete one optional tomb.
Kill and loot 10 small animals (rabbits, chickens, rats).
Complete one challenge.
Kill and loot 10 large animals (deer, boar, wolves).
In multiplayer, escape death 3 times by using the rope ascender.
Complete a match in all multiplayer modes.
Kill 10 multiplayer enemies using your melee attack.
Survive 10 explosions in multiplayer.
Revive a teammate in a multiplayer match.
Kill 2 multiplayer enemies with a single explosive.
In multiplayer, be the only player on your team that isn't dead or downed.
Reach level 10 in multiplayer.
Catch a player in a snare trap in multiplayer.
Purchase a new multiplayer character.