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.
Build a coaster 1500m 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.
Repay a loan of $20,000.
Spend $10,000 on marketing in one month.
Unlock DexR's Science Shenanigans.
Complete a research project.
Train a member of staff to the highest level.
Achieve a Park Rating of 1000.
Build a 750m long coaster.
Unlock Princess Amelie's Fairy Tale.
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 King Coaster's Royal Decree.
Complete a challenge.
Complete five challenges.
Complete ten challenges.
Achieve a monthly profit of $10,000.
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 2500m long.