Hi icespirit :-) "Luxury things" can also be said as "luxuries."

The rules are relaxed in conversation, so your sentence is fine there in my opinion. For writing, or if you wish to be more correct in your speaking style then the changes Andrew and Nanren suggest are the way to go.

Suddenly I understood that no matter how much money, or how many achievements and luxury things we have, we all need help. The problem is that "much" is used for uncountable noiuns, such as water, salt, flour, money. "many" is used for countable, such as dollars, acheivements and things. So, as Andrew says, it needs a change to be proper.

Thank you for your help, Andrew.

I would modify it a bit. Suddenly, I understood that no matter how much money or how many achievements and luxury things we have, we all still need help.