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