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