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