Here is the full list of all 23 Midas Gold Plus achievements. It takes around 200 hours to unlock all of the achievements on Windows.
Obtain 11 Legendary Items
All buildings should be at least 2000 Level
Upgrade Hall Of Champions to Level 10 on Midaeum
Reach Rank High Warlord On raids
Unlock Felix, The Vanquisher to reveal the Secrets of the Void
All buildings should be exactly 1111 Level
Get all upgrades and multipliers in the Exotic Merchant
Upgrade All Artifacts to the Max Level
Unlock Kenny, The Rogue to unlock Energy mode
Reach Midas Level 8
Reach Rank 2 On raids
Complete 5 Knowledge Researches on Idle Profits
Complete 50 University Researches
Get at least one Merchants Guild
Gather 100 Diamonds
Get the "Trophy of the World Domination" Upgrade
Unlock "Gold Flowers" Achievement
Get the "Trophy of times" Upgrade using Benedict the timeless knight
Reach 65% Critical Chance
Find the War Oupost
Conquer Sparta 5 times
Obtain 9 War Outpost Emblems
Complete Level 20 in all buildings on war Outpost