It is indeed a remarkable achievement.

这的确是非凡的成就。

It was a remarkable achievement for such a young player.

如此年轻的选手有这样的成绩真是了不起。

It's a remarkable achievement.

这是一个值得纪念的成就。

This is a truly remarkable achievement.

这是一个真正显著的成就。

We rejoiced in his remarkable achievement.

我们为他的巨大成就而高兴。