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TIME-SENSITIVE ALERT: If you didn't get Varian Wrynn, you can take advantage of the current full refund period to craft him, get the achievement, and DE him at no cost. Act now!
I'm making this thread a liiiiiittle early because I want to help people take advantage of what may well be a time-limited opportunity: completing the Rogue and Priest questline-related achievements without owning the required cards. The only alternate way to complete these achievements is to steal the questline rewards from an opposing player, and the Day 1 meta presents a great opportunity for this, as people will be playing unoptimized meme decks and trying out their fancy new cards. It could happen that these questline decks are unviable and almost impossible to find on ladder afterwards, and this is pretty hard to pull off. There are other questline-related achievements, but these two are the only ones that require a one-time event and are therefore viable for these purposes. So how is this done?
Instant Gratification: Draw the Purified Shard the same turn you shuffle it into your deck.
The simplest way to do this is by waiting until they play the questline reward, then on your turn playing Mindrender Illucia + Lorekeeper Polkelt + Prize Vendor or any 'draw a card' effect like a Loot Hoarder or Bloodmage Thalnos deathrattle. Note that tutor effects of any kind ignore deck order, although they do not change Polkelt's ordering of the deck. This will of course only work if your opponent doesn't draw the shard the same turn they play their questline reward. Example deck: AAECAa0GBPvRA/bWA6iKBJegBA3LzQP73wOS5AOhoASY6gP44wPBnwSFnwS24QPXzgOZ6wPo7wPWoAQA
Okay, but what if I don't own Mindrender Illucia? I don't have her either, unfortunately. It's still possible, although it gets a lot messier, with Rogue. The main thrust of the combo will always be Faceless Manipulator + Shadowstep + play questline reward for 3 mana. From there, you need to have played Potion of Illusion on either a Lorekeeper Polkelt or a Primordial Protector so that you can play it for 1 mana here. The nice thing is that both of these cards help you draw the Potion of Illusion from your deck. If you went the Polkelt route, you also need a draw effect that same turn, which can be set up in advance by Silverleaf Poison but can be included in that same turn via discount or coin generation effects with Prize Vendor. Also, if you're lucky, you can steal the reward through Plagiarize. Example deck: AAECAYO6AgTl0QP21gOoigTl0QMN5dMDkuQDmOoDqesDq+sD3uwD9p8E958EoaAErKAE6/YDtuEDitADAA==
Expecting an Exploding Pen?: Play every Spy Gizmo in one game.
This is also done with Rogue. The good thing is you don't need to force the shard draw like in the Priest achievement, but you do need to play 5 1-mana cards, and ideally speaking you want to do this the very same turn you steal the reward, to ensure consistency. The same Faceless Manipulator + Shadowstep + play questline reward for 3 mana base combo remains, however to play all 5 Spy Gizmos you need 13 mana in one turn. Options include: Backstabing an Efficient Octo-bot, aka the dream scenario. Generating enough coins through Loan Shark and Tomb Pillager. Discounting the spell-based Spy Gizmos with Preparation. Having the reward through Plagiarize so you don't need extra mana in the first place. Generally speaking, some combination of these options should get you through. You should note though, that you need the hand space when you play the questline reward. And also that the opponent is likely to play the stealth-giving Spy Gizmo on their questline reward the turn they play it, so you should plan to weather that 9/7. Example deck: AAECAYO6AgKoigSXoAQOzrkDx84D5dMD590DkuQDmOoDq+sDkZ8E9p8E958EoaAErKAE6qAE6/YDAA==