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30.4 patch included achievements for older sets and boy did Team 5 cook on these. Many of them could be considered "puzzle" achievements, some feel likely they rely on RNG, and (as far as I can tell) none of them grindy.
I'm not even sure HOW to do a few of them. For example... how will you cast BEEEESSS!!! without the Bees attacking? Can you cast the spell when your board is full?
Edit: As I complete these, I'm going to add some notes on what worked.
Rise of Shadows:
Cast Plot Twist and end up with twice as many cards as you started with.
Destroy 6 minions with a single Daring Escape.
Summon 10 Treants with The Forrest's Aid in one turn.
- Completed! Guff gave me lots of mana. Animated Broom gave Treants rush. Would have been easier if I owned Floop's Gloop, but I don't.
Attack with a single Whirlwind Tempest 4 times in one turn.
Add 10 spells to your hand with a single Mana Cyclone's Battlecry.
End your turn with 4 different versions of Dr. Boom in play.
Have a friendly 0-Cost minion in a Duel! and survive.
- Completed. Two paths to completion: The easiest way is to build a deck of all spells +4-6 0-Cost minions and then play Duel when the enemy board is full. The 0-Cost minion will survive because an enemy minion isn't summoned. The harder way is to play Footman + Duel!. Footman will make the 0-Cost minion immune. Footman will also be helpful when completing the Warmaul Challenger achievement below.
Summon 60 Mana worth of minions with a single Mass Resurrection.
Summon a chain of 4 Obvlivitrons off of another Obvlivitron's Deathrattle.
Deal 100 damage with a single Hagatha's Scheme.
Saviors of Uldum
Cast BEEES!!! without any of the Bees attacking.
- Completed! First I tried to cast BEEES!!! with a full board, but the game won't let you. Then I tried to cast BEEES!!! with Wild Pyro on the board. But Wild Pyro triggers AFTER you cast a spell. THEN I used Li'Na + Beeees!!!. Li'Na's effect triggers before any of the Bees spawn, thus they cannot attack.
Summon 7 of the same Murloc with a single Tip the Scales.
Complete Hack the System on the same turn it was played.
Destroy both heroes at the same time with Riftcleaver.
Summon 30 Locusts in one game.
Attack the enemy hero with Highkeeper Ra.
End your turn with 7 minions that each have 30-Health or more.
Destroy exactly 5, then exactly 2 minions with a single Earthquake.
Win a game after casting 4 Puzzble Boxes of Yogg-Saron.
Play 8 Combo cards created by Whirlkick Master in one turn.
Descent of Dragons
End your turn with 6 of Chenvaala's Snow Elementals in play.
Draw a Dragon while not holding one with Breath of Dreams 2 times in one game.
Guess correctly with Envoy of Lazul 3 times in one game.
Destroy the enemy hero with one of Nithogg's Storm Eggs.
End 4 consecurive turns with MORE than 10 cards in hand as a Warlock.
Have Deathwing, Mad Aspect survive his Battlecry at exactly 1 health.
Have the minion summoned by Sanctuary take no damage for a turn.
Win a game after summoning 8 or more Dread Ravens.
Summon 12 Waxadreds in one game.
Complete Clear the Way with the 4/4 Gryphon summoned by it.
Ashes of Outland
Draw (but don't discard) 3 cards that aren't spells with a single Fungal Fortunes.
Cast 6 Renews in a single turn.
Have Warmaul Challenger survive a battle to death with a poisonous minion.
Deal exactly 1024 damage to a Mo'arg Artificer.
Spend 8 Mana in a single turn before your 5th turn as a Warlock.
Have Imprisoned Observer destroy EVERY enemy minion it saw when entering play.
Attack 3 times with the same Akama Prime.
Cast 10 librams of Wisdoms on the same minion.
End 8 consecutive turns while in Metamorphosis.
Draw a Clefthoof with Scavenger's Ingenuity.
Summon a 20-Attack Totem with Totemic Reflection.
Scholomance Academy
Teach a single Educated Elekk 15 different spells.
Draw 10 Soul Fragments in one turn.
Add 7 copies of the same minion to your hand with a single Potion of Illusion.
Give Speaker Gidra +10/+10 with her Spellburst effect.
Summon two Beasts that cost (5) or MORE with Guardian Animals.
Using Steeldancer, summon a minion with the same stats as your weapon.
Destroy a Failed Student with Disciplinarian Gandling.
Deal 10 damage at once with Ras Frostwhisper.
Have High Abbess Alura cast the Legendary spell that triggered her Spellburst.
Summon a Blood Herald with 30 or more Attack.
Summon an 11/11 Student with Ceremonial Maul.