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