Here is the full list of all 29 URBO achievements.
Make 20 x3 combos
Reach 100 000 population in all surroundings in total
Discover all islands at any multi-island surroundings
First activation of the tower
Unlock ARCHIPELAGO
Unlock all surroundings
Build 20 buildings of level 8 in all surroundings in total
First ship voyage
Unlock VALLEY
Build 10 buildings of level 8 in all surroundings in total
Reach 50 000 population in all surroundings in total
Unlock WATERFALL
Make 10 x3 combos
First 4x combo of merges
Build 5 buildings of level 8 in all surroundings in total
Make 5 x3 combos
Reach 20 000 population in all surroundings in total
First merge of 9 buildings
First entry to photomode
First island completed
First 8 level building
Reach 5 000 population in all surroundings in total
Get 21 sets of cards in total
First 7 level building
First 6 level building
First 5 level building
First building built
Unlock all sets of buildings
Build a town in each URBO surroundings