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