Here is the full list of all 24 Rhombus Legends achievements.
Gather 10 trophies.
Gather 200 trophies.
Gather 500 trophies.
Open 10 boosters.
Open 250 boosters.
Open 750 boosters.
Try 50 unit upgrades.
Try 250 unit upgrades.
Try 750 unit upgrades.
Mine structures of level #2.
Mine structures of level #3.
Mine structures of level #5.
Fight 50 duels.
Fight 500 duels.
Fight 1000 duels.
Do 50 raids.
Do 500 raids.
Do 1000 raids.
Kill 20 world Bosses.
Kill 100 world Bosses.
Kill 300 world Bosses.
Complete 1 Portal Challenge.
Complete 10 Portal Challenges.
Complete 50 Portal Challenges.