These achievements are harder to avoid than they are to get, so I'll just rapid-fire them. For Master, Foreman, Contractor, and Developer, be warned that sometimes directly upgrading doesn't trigger the achievement, it seemed to be 50/50 for me.

Merge 3 or more level 4 buildings by placing them adjacent to each other, or use cards to upgrade a level 4 building.


Merge 3 or more level 5 buildings by placing them adjacent to each other, or use cards to upgrade a level 5 building.


Merge 3 or more level 6 buildings by placing them adjacent to each other, or use cards to upgrade a level 6 building.


Merge 3 or more level 7 buildings by placing them adjacent to each other, or use cards to upgrade a level 7 building.


Activate the central tower by merging a building within the marked squares around it. This is one of the ways to get cards.


Gather 21 card activations over all games. You don't need to have 21 at once, save up cards, or earn them all in one run, so this achievement will most likely pop while you get the rest. You can gather cards by activating the tower or by merging excess buildings (i.e. merging 4 - 9 buildings instead of only 3). Merge combos also contribute to this.


The easiest achievement in the game, but also the most confusingly worded. At first I thought you'd need level 8 buildings in all slots around the tower to 'complete' the game, but all you need for this achievement is for all slots on the island to be full. Just spam click everywhere until there are no empty spaces.

These achievements are harder or more out of the way than the others, you will likely need to try specifically to get them.

Just click the '?' button in the lower-left of the screen during a game, and enter photomode.

EDIT: For the following achievements, if you're having trouble fitting the buildings in, make sure to place the center of your cross on one of the tower square's corners, like in this image[imgur.com] provided by Dexter in the comments :)
Arrange buildings as follows, where o's are any building or an empty space, just not the tier you're trying to merge, and x's are all the same tier (I'd recommend tier 1s for ease):

ooxoo
ooxoo
xx_xx
ooxoo
ooxoo

Then finish the cross by placing another 'x' in the center. This will merge all 9 buildings and pop the achievement.


The setup for this is similar to Pro, but with different building tiers. I'm just gonna demonstrate using 1, 2, 3, 4, but technically you could do this with higher tiers if you want to flex. Arrange buildings as follows:

oo1oo
oo1oo
22_33
oo4oo
oo4oo

Then finish the cross by placing another '1' in the center. This will trigger a chain reaction, merging in all 3 1s, then 2s, then 3s, then 4s, and pop the achievement.

EDIT: Another (possibly easier) way of completing this achievement, suggested by Sanya in the comments, is to arrange your buildings like this:

122
1_3
443