请教各位，求解三个成就？

zlfchman

就剩下这么三个就全成就啦！
1、Long Service Medal

Complete Mass Effect 3 twice, or once with a Mass Effect 2 import.
50

2、Insanity

Finish the game on Insanity without changing diffi***y after leaving Earth.
75

3Unwavering

Finish all multiplayer maps on Gold or all single-player missions on Insanity.
50
我普通完成一次，用me3存档导入，第二次用疯狂难度完成结局，这些成就都没有解开，什么原因？过程没有改过难度，完成两次游戏，杀敌5000的成就都解了，就是这个很费解