Here is the full list of all 10 Bus Tycoon ND (Night and Day) achievements.
Your company is in service for 50 days!
You can buy a hydro bus!
You can buy an electic bus!
Your company owns 15 buses!
Your company owns 10 buses!
Your company owns 5 buses!
Your company is in service for 20 days!
You can buy new biofuel buses!
Your company is in service for 10 days!
You can buy new diesel buses!