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