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Yeah, I remember finding this in another pack and opening up vanilla to experience the same thing. The amount of times you're in that specific situation is so minimal that not a lot of people realize it was bugged out.
The crash reports say: # There is insufficient memory for the Java Runtime Environment to continue.
Meaning you're running out of memory. If you have 8gb, don't dedicate more than 6 AT THE MOST. Also, it looks like you only dedicated 131mb total.
You should never dedicate all of your RAM, that's a bad idea. 4gb is more than enough to run the pack. It's been tested by many people to use 4 and loadup just fine.
Yup, I've been aware of this issue for well over a month now and the Simple Achievements mod dev even knows about it. He chose not to do anything about it. So I'm either going to remove the mod and replace it or find another option.