都可以！
分析：
1. keep balance, 更倾向的趋于一种静态的保持，而且，keep balance中的balance前面是经常要加修饰性的定语，例如：keep one's balance.
1. achieve balance, 更倾向于一种动态的完成过程，achieve balance中的balance前面的定语可加、可不加。
用keep,用keep balance between something and something表示在两者之间保持平衡
keep 固定搭配
合
1.to strike a proper balance between work and leisure; to alternate work with relaxation; to combine work with adequate rest; to combine exertion and rest
2.proper arrangement of work and rest
balance to keep fit
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