这两个词词义上真没什么过多区别
牛津和剑桥都是两个互为解释的~~
如果硬要区别，acquire有种慢慢获得的意思（但acquire （=buy）a house....），而obtain则有种通过努力的意思，但也不绝对，主要还是搭配问题，注意几点见下
用法和搭配上注意几点
1.obtain搭配 advice/information/permission
e.g. Have you obtained permission into the hall?
2.obtain 经常用manage to obtain sth，而acquire不这么用
e.g. He finally managed to obtain what he wanted.
3.acquire搭配 a knowledge/reputation/taste(habit)
e.g. He acquired a good knowledge of English during his stay in England.
He has acquired a reputation for dishonesty.
I have acquired a taste for(=like) olives these days.
(这个意思有个引申词组，an acquired taste 开始觉得不好，但慢慢觉得好了
如：Maybe you will not get interested in Jay's songs at first, but when you listen quietly, you will find an acquired taste in it.）
其他用法两个基本可以通用
参考资料：Kakyo Original
