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