Here is the full list of all 10 Penguins Arena: Sedna's World achievements. It takes around 3-4 hours to unlock all of the achievements on Windows.
Win 50 duels
Take part in 150 fights
Win 100 fights
Take 200 bonus
Win 10 duels
Take part in 40 fights
Win a match without losing any team member
Win 20 fights
Take 50 bonus
Win 5 fights in a row