You need to be in the disco room.It's here.
Also You DON'T need to Finish the Ancient Frog.
https://steamhost.cn/steamcommunity_com/sharedfiles/filedetails/?id=162642746
你需要来到小鸡舞厅。它在地图的这个位置。
另外，你不需要完成运送所有黄色青蛙的任务。

In fact he didn't dance.He can just yawn.But why he yawn?Maybe he has just danced a disco.
So the aim is simple.Just make him yawn.
事实上，小鸡根本就不会跳舞，他只是打了个呵欠。不过为什么打呵欠呢？也许他刚刚跳过舞吧。
所以，我们只要让小鸡打呵欠就好了。

Dance must be very tiring.
So you MUST finish these actions WITHIN TWO SECOND.
The action is:
MOVE and Change direction for at least FOUR TIMES.Then STOMP to let him feel tired.
https://steamhost.cn/steamcommunity_com/sharedfiles/filedetails/?id=162645453
Then he'll make a yawn.Your achievement complete.
跳舞一定会很累...
所以小鸡应该很快速的来回移动。
你要在两秒内让小鸡至少来回移动四次，然后让他猛踩地面。
好的，小鸡很累了，他打了个呵欠。于是你获得了成就：小鸡跳舞。

About 4 turns
By testing for a while I find that you must change direction for at least 3 times,not four.
But in order you can make it correctly I recommend you to perform 4.
关于四次转身
你只需要至少转身三次，但为了确保成功，建议转身四次。
About stump
When I test and try I find that if you make your turn on an edge(means you'll have a vertical position change too)and you stump when you're falling down,you may fail to stump. But you can hold on X ot Enter.After Toki Tori landed he will pass the stump action and directly make a yawn.That counts,too.
关于没有踩出来的问题
如果你踩的时候正好是在往下掉，你就可能踩不出来。
不过，如果你这时一直按着X或是回车，小鸡可能会直接打呵欠，这也可以。
Acting too slow and can not make it?Or still not understand how to?
You can just do"left right left right stump".This only change direction 3 times but it works well.
手速太慢？或是还没弄懂？
试试“左右左右X”吧，肯定有效。