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
Win a match without losing any team member
Take part in 40 fights
Win 10 duels
Take 200 bonus
Win 20 fights
Take 50 bonus
Win 5 fights in a row