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