Here is the full list of all 32 Planet Coaster achievements. It takes around 50-60 hours to unlock all of the achievements on Windows.
Complete a research project.
Unlock Princess Amelie's Fairy Tale.
Build a 750m long coaster.
Gain a gold star in career mode.
Gain a silver star in career mode.
Gain a bronze star in career mode.
Create your avatar and place them on the globe..
Gain all the stars in career mode!
Unlock DexR's Science Shenanigans.
Unlock King Coaster's Royal Decree.
Complete a challenge.
Complete five challenges.
Complete ten challenges.
Achieve a monthly profit of $10,000.
Repay a loan of $20,000.
Spend $10,000 on marketing in one month.
Achieve a Park Rating of 1000.
Train a member of staff to the highest level.
Get a coaster up to 100mph.
Get a coaster up to 150mph.
Get a coaster up to 200mph.
Create a coaster with an 80m drop.
Create a coaster with a 150m drop.
Build a coaster 1500m long.
Build a coaster 2500m long.
Create a coaster with 5 moments of airtime.
Create a coaster with 10 moments of airtime.
Wow guests with a coaster with 15 moments of airtime.