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.
Win a ranked match in every multiplayer mode.
Kill 20 enemy players in multiplayer using a turret.
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 2 multiplayer enemies with a single explosive.
Revive a teammate in a multiplayer match.
Kill 10 multiplayer enemies using your melee attack.
Catch a player in a snare trap in multiplayer.
Kill a zip-lining enemy player in multiplayer.
Complete a match in all multiplayer modes.
Reach level 10 in multiplayer.
Purchase a new multiplayer character.
Survive 10 explosions in multiplayer.
Shoot 10 enemies off zip lines.
Find all documents, relics and GPS caches.
Complete all challenges.
Kill FeeFee the crab.
Find 75% of GPS caches.
Complete all optional tombs.
Fully mod and completely upgrade all weapons.
Collect 75% of all relics.
Complete all conversations with the Endurance crew.
Incapacitate 25 enemies with dodge counter.
Purchase all skills in all categories.
Complete the game.
Find 75% of all documents.
Shoot a bundle of dynamite out of the air.
Fully mod and completely upgrade any weapon.
Kill 40 enemies with the shotgun.
Kill 75 enemies with the rifle.
Kill and loot 10 flying animals (crows and gulls).
Purchase all skills in one category.
Find 25% of GPS caches.
Loot 200 enemies.
Collect 5000 pieces of salvage.
Force an enemy to drop dynamite that kills two people when exploding.
Collect 25% of all relics.
Rope pull 5 enemies off edges.
Kill 25 unaware enemies.
Kill 35 enemies with the pistol.
Perform 50 headshot kills in the single player campaign.
Perform 15 finishers.
Kill and loot 10 small animals (rabbits, chickens, rats).
Find 25% of all documents.
Kill 50 enemies with the bow.
Complete one challenge.
Kill and loot 10 large animals (deer, boar, wolves).
Complete one optional tomb.