Proven in the Field
Reach Rank 10
Rare18.3%last reported global rate
Steam
The Mound: Omen of Cthulhu Achievements
Official Steam achievement definitions and latest reported global unlock rates, ordered from rarest to most common.
Total achievements25
Rarest rate0.200%
Ultra rare6
Last checkedSep 21, 2026
Delayed official data
Rates and award counts were last observed on Sep 21, 2026.
A Fateful Commission
Successfully complete an advanced mission
Uncommon24.6%last reported global rate
A Dire Commission
Successfully complete a mid-Level mission
Uncommon47.9%last reported global rate
Greed Rewarded
Recover 50% more treasure than the Captain demanded during an expedition
Common87.4%last reported global rate
A Little Extra
Recover 20% more treasure than the Captain demanded during an expedition
Common92.2%last reported global rate