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