This achievement looks daunting at first, but it's actually quite easy. If you combine the trap cards "D.D. Dynamite" and "Banquet of Millions", you can inflict over 9,000LP damage in a few minutes maximum.
Additional tips: If your primary goal with Master Duel is to get the achievements, then I'd recommend the following tips:
- Invest your gems in decks that specifically aid to the completion of achievements
- Purchase the duel pass with 600 gems to obtain SR/UR crafting materials
- Do NOT surrender in a duel where you have made progress to an achievement. Stats are added up AFTER the duel has been completed, not during.
- Prioritise getting the achievements BEFORE reaching platinum rank. They become very difficult in higher ranks due to how the game is
- Focus crafting generic staples such as Ash Blossom, Maxx "C", and Pot of Extravagance early as they can be applied to any deck to improve their performance