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