Here is the full list of all 12 Transport Giant achievements.
Play for at least 100 hours
Play for at least 75 hours
Finished Australia campaign
Play for at least 50 hours
Finished Europe campaign
Played for at least 10 hours
Exceed demolition costs of 1,000,000
Finished USA campaign
Earn at least 100,000,000
Played for at least 1 hour
Possessed 25 vehicles at a time
Possessed 10 vehicles at a time