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