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