If a place is reachable, it is possible to get to it.

The town is easily reachable on foot. 那个镇子走路去很容易。

If a level, especially a high one, is reachable, it is possible to get to it.

Saving 5% of your salary should be a reachable goal. 把你工资的5%存下来应该是可以达到的目标。