I have following suggestions for achievement which might make raids more fun and give veterans something to work towards:
1) Achievement to clear each boss with a squad comp which has 1 of each class, 10th can be a repeat.
2) A collection that starts when you down the boss and then fills up as you down each boss on different class. The reward can be something unique, like a boss skin buyable with shards or something.
The 2 together would mean that there would always be a demand for each class and people willing to fill that demand.
Feedback appreciated.
And i suppose i know already that some of the criticism will be to do with gearing all 9 classes or have extra character slots. This is why i suggest the reward from collection to be the boss skin buy able with shards so everyone can have it without the paywall of 9 characters etc.