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