其实都可以,只是用法不同：
I got here.
I have arrived.
I reached some place.
get to 其实在一起就可以和reach替换了,可以看作及物动词,表示到达,接名词!
arrive 是不及物动词+at/in 再接地点名词!
reach 是及物动词,直接接地点名词!