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