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