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