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