I noticed that two of the 25 achievements in Ys Chronicles 1 for Android have a obtain rate of 0%,
These being "Ethologist" and "Be Proud".
One asks for a complete bestiary and the other for a new record in time attack.
I just completed the game and I did have the complete bestiary, but didn't...
Game called Gravity Marsh has one achievement that seems unobtainable, but what i've seen on the leaderboards many people obtained it.
I got past level 1-10 and have almost all achievements, the only one i'm missing is Celebrate! achievement which you can get by winning the game.
Though level 11...