The Parklife Add-on for Cities: Skylines has 8 achievements worth 140 gamerscore.
Have a maximum level park made with Park Tool
Have 10 parks made with Park Tool
Have a park with all zoo buildings built in it
Have 5 pedestrian Walking Tour lines
Have a Park Maintenance Service and a Zoo, Nature Reserve and Amusement Park in your city.
Have a park with all Amusement Park buildings built in it
Have a park with all Nature Reserve buildings built in it
Have 15 Sightseeing Bus lines