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