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.
Win a ranked match in every multiplayer mode.
Complete a match in all multiplayer modes.
Kill 2 multiplayer enemies with a single explosive.
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.
In multiplayer, escape death 3 times by using the rope ascender.
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.
Survive 10 explosions in multiplayer.
Complete all challenges.
Complete the game.
Find all documents, relics and GPS caches.
Fully mod and completely upgrade all weapons.
Purchase all skills in all categories.
Complete all optional tombs.
Complete all conversations with the Endurance crew.
Fully mod and completely upgrade any weapon.
Find 75% of all documents.
Collect 75% of all relics.
Find 75% of GPS caches.
Purchase all skills in one category.
Kill FeeFee the crab.
Kill 40 enemies with the shotgun.
Kill 75 enemies with the rifle.
Shoot a bundle of dynamite out of the air.
Purchase a new multiplayer character.
Reach level 10 in multiplayer.
Loot 200 enemies.
Kill 25 unaware enemies.
Incapacitate 25 enemies with dodge counter.
Shoot 10 enemies off zip lines.
Rope pull 5 enemies off edges.
Force an enemy to drop dynamite that kills two people when exploding.
Collect 5000 pieces of salvage.
Kill 35 enemies with the pistol.
Collect 25% of all relics.
Find 25% of GPS caches.
Kill and loot 10 flying animals (crows and gulls).
Kill 50 enemies with the bow.
Perform 15 finishers.
Perform 50 headshot kills in the single player campaign.
Find 25% of all documents.
Kill and loot 10 small animals (rabbits, chickens, rats).
Complete one challenge.
Complete one optional tomb.
Kill and loot 10 large animals (deer, boar, wolves).
Buy every upgrade and character in multiplayer.
Reach level 60 in multiplayer.