Here is the full list of all 46 Anthem achievements worth 1,000 gamerscore. It takes around 60-80 hours to unlock all of the achievements on Xbox One.
Complete 12 Colossus Gear I Challenges
Complete a mission, contract, or stronghold with a masterwork javelin rarity.
Complete Part 2 of Brin's Need to Know story.
Complete Yarrow's Shallow Grave story.
Complete Matthias's Riddles of Raban Maur story.
Complete tasks to aid the Arcanist cause.
Discover all districts, landmarks, and hidden places in Great Falls Canyon.
Discover all districts, landmarks, and hidden places in Emerald Abyss.
Complete a mission, contract, or stronghold with an epic javelin rarity.
Complete Return to the Heart of Rage.
Complete Part 1 of Brin's Need to Know story.
Complete Dax's Emerald Abyss story.
Complete a mission, contract, or stronghold with a rare javelin rarity.
Complete Matthias's Triple Threat story.
Complete The Fortress of Dawn.
Complete Yarrow's Keeping Promises story.
Complete Matthias's Search for Knowledge story.
Complete The Tomb of General Tarsis.
Complete a mission, contract, or stronghold with an uncommon javelin rarity.
Complete Finding Old Friends.
Complete Incursion.
Complete Early Warnings.
Complete all Bastion Collectibles challenges.
Complete 12 Ranger Gear I Challenges
Complete 3 Assault Rifle I Challenges
Complete 3 Autocannon I Challenges
Complete 3 Marksman Rifle I Challenges
Complete tasks to aid the Freelancer cause.
Complete 12 Interceptor Gear I Challenges
Complete 3 Grenade Launcher I Challenges
Complete tasks to aid the Sentinel cause.
Complete 3 Light Machine Gun I Challenges
Complete 3 Heavy Pistol I Challenges
Complete 3 Shotgun I Challenges
Complete 12 Storm Gear I Challenges
Complete 3 Machine Pistol I Challenges
Complete 3 Sniper Rifle I Challenges
Discover all districts, landmarks, and hidden places in Academy Ruins.
Discover all districts, landmarks, and hidden places in East Gate.
Discover all districts, landmarks, and hidden places in Eastern Reach.
Discover all districts, landmarks, and hidden places in Fortress of Dawn.
Discover all districts, landmarks, and hidden places in High Road.
Discover all districts, landmarks, and hidden places in Monument Watch.
Discover all districts, landmarks, and hidden places in Ruins of Shadowmark.
Discover all districts, landmarks, and hidden places in Valley of Tarsis.
Complete Freelancer Down.