Here is the full list of all 31 Kingdom Eighties achievements. It takes around 15-20 hours to unlock all of the achievements on Windows.
Find the missing trophy
Destroy a portal in a forest
Destroy another portal
Enter a cave
Complete Episode I
Complete Episode II
Complete Episode III
Complete Episode IV
Destroy a portal on the streets
Destroy a portal around the mall
Recruit someone athletic
Recruit someone handy
Recruit someone smart
Recruit someone friendly
Wait for the bus
Uncredited professional BMX rider making it rain coins
Get something back from the past
Defeat 10 greed with a machine gun
Get eaten by a shark
Slap a monster truck
Rainy day at Paradise Estate with Rainbows in tow
Complete a level with only two workers
Lose the Crown, and take it back
Clear all the trees on any level
Complete the game on Hard
Complete the game on Cursed
Survive for 50 days in one level
Complete the game in 50 days or less
Complete a level with no more than 20 kids
Lose 80 coins to the waters
Destroy a portal on Peaceful