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