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