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