Here is the full list of all 19 Countryballs: Over The World achievements. It takes around 0-1 hour to unlock all of the achievements on Windows.
Unlocked by getting 20 points in Find Poland endless mode
Hue
Herro
Je m'appele Claude
Germoney
'Murica is a damn continent!
Everything is good!
Reeee
I love my brother Czech
Dr. Österreich
What should I say?
Omae wa mou shindeiru!
Czech stronk!
Polen uber alles!
You wanna go for a vodka?
I of helping
Tunak tunak tun
What did they do to me?
Yeah.