Here is the full list of all 23 Forager achievements worth 1,000 gamerscore. It takes around 40-50 hours to unlock all of the achievements on Xbox One.
Collect every tool and weapon
Collect every accessory
Reach Void level 30
Complete the Fire Temple
Open every big treasure chest
Collect every seal
Buy every land
Complete every museum bundle
Learn every skill
Collect every artifact
Complete the Crystal Cave
Mine the giant crystal
Activate a droid
Fail miserably at a trivia minigame
Complete the Ancient Tomb
Own 10 lands and 5,000 coins
Complete the Skull Maze
Build 200 structures
Gather royal steel or royal clothing
Have one of each gem in your inventory
Achieve every other feat
Have 1,000,000,000,000 coins
Own 100 nuclear structures at once