The Chosen Ones

Well since "your" achievements (of which you couldn't even come up by yourself) are so extraordinaire, let's take a few examples of them as well:

Lightning - Kill a boss within 10 seconds.

Requires a little farming through the campaign to achieve.

Hunter - Kill at least 10,000 enemies

"We don't need achievements like this because we have multiboard showing these."

+ It requires farming.

Gold - Obtain 999,999 gold

"We don't need achievements like this because we have multiboard showing these."

+ It requires farming.

Game Points - Have gathered over 100,000 Game Points

"We don't need achievements like this because we have multiboard showing these."

+ It requires farming.

Master Alchemist - Obtain Alchemy level 50.

"We don't need achievements like this because we have multiboard showing these."

Dragon Slayer - Defeat all Elite and Epic bosses.
Master Slayer - Defeat all Elite and Epic bosses at **** difficulty.

"We don't need achievements like this because we have multiboard showing these."

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A fitting description for an achievement would probably be "to accomplish of something uncommon", i.e. a hilarious death by reflected damage, not "to accomplish something positive" solely. Having "negative" achievements doesn't mean they're discouraging, it's just to bring opportunities.

And as far as I can see (and what I showed in the examples), your only way to keep people playing the campaign is to make it farmed like it was 999; it's despicable, the game (campaign) ITSELF should be interesting enough, instead of having to limit some content behind unreasonable farming.