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