Here is the full list of all 25 Cosmo's Quickstop achievements.
Earn a Cosmometic
Beat the Switcheroo in campaign mode
Beat the Squeeb in campaign mode
Beat the Inspector in campaign mode
Beat the Time Bubble
Beat the campaign on any difficulty
Beat the campaign only playing on challenge difficulty
Earn all of the Cosmometics
Get 1 task to max level
Get all tasks to max level
Play with a supercharged task
Break a task
Play a challenge day
Play half the challenge days
Play all the challenge days
Earn 3 stars on a challenge day
Earn 3 stars on all challenge days
Play a day in sandbox mode
Earn over $2000 in a single sandbox day
Watch the fish for 3 uninterrupted minutes
Get bit by Quark, the space cat.
Dance with all the different alien species
Earn $50,000 over all modes and saves.
Earn $100,000 over all modes and saves.
Earn $200,000 over all modes and saves.