Here is the full list of all 22 Myriads: Renaissance achievements.
Build your first farm
Loot a lost secret
Build your first sawmill
Build your first mine
Build your first defence tower
Extend your capital island
Extend the city by building a paved square
Build a shipyard
Build your first lighthouse
Build a cartographer
Colonise your first archipelago
Turn a colony into an exploitation colony
Turn a colony into a trading colony
Develop your capital island and reach a population of 15 citizens
Restore an academy
Take down a stronghold
Take down all 3 strongholds
Beat Catena and win the game for the first time (any difficulty)
Beat Catena in Builder mode (any difficulty)
Beat Catena in Sailor mode (any difficulty)
Beat Catena in Hard (any mode)
Beat Catena in VeryHard (any mode)