Here is the full list of all 36 My Lands: Black Gem Hunting achievements.
Seize a Mine
Annihilation of a lvl. 1 Ruin
Upgrade the Main Building to the 5th level
Annihilate 50 Ruins of any level
Annihilation of a lvl. 2 Ruin
Annihilation of a lvl. 3 Ruin
Annihilation of a lvl. 4 Ruin
Annihilation of a lvl. 5 Ruin
Annihilation of a lvl. 6 Ruin
Annihilate the Arch-ruin
Increase the Ruin annihilation rating by 100.000.000 points
Obtain the Captain rank
Obtain the Master rank
Obtain the Marshal rank
Obtain the Suzerain rank
Complete 150 quests in a row
Complete another 200 quests in a row!
Complete the last 50 quests in a row!
Reach the Faction Rating value of 500 000 by eliminating the opposing Faction troops
Reach the Faction Rating value of 5 000 000 by eliminating the opposing Faction troops
Reach the Faction Rating value of 50 000 000 by eliminating the opposing Faction troops
Reach the Faction Rating value of 250 000 000 by eliminating the opposing Faction troops
Reach the Faction Rating value of 1 000 000 000 by eliminating the opposing Faction troops
Hire your first Hero
Hire your second Hero
Hire your third Hero
Upgrade one of the Hero Skills to level 3
Upgrade three of the Hero Skills to level 3
Upgrade five of the Hero Skills to level 5
Equip your Hero with an Artifact of level 3
Equip your Hero with 9 Artifacts
Read any Scroll
Upgrade one of your buildings to the “perfect” level
Re-seize a Pit
Find and seize a flying island with the Salt Lake
Buy the Anthology book of futuristic science