For this achievement you'll need to unlock the 4 shovel head upgrades, they are;
• Broken Shovel Head; You'll receive this shovel head once you reach level 1
• Seed Shovel Head; You'll receive this shovel head once you reach level 5
• Pond Shovel Head; You'll receive this shovel head once you reach level 7
• Treecutter Shovel Head; You'll receive this shovel head once you reach level 15
You're rewarded experience in this game each time you achieve a feat, for example, the first time a Whirlm visits your garden, or growing a daisy to full maturity, gaining experience in this game is easy, there's plenty of awards out there for you to complete and earn yourself some experience. The small daisy in the top right corner of your screen represents your current level, the number in the middle being your current level and the petals around it being your progress toward the next level.
You do not need to purchase the 2 upgrades for your shovel for this achievement, they are;
• Chocolate Sniffer; You purchase this from Ivor Bargains store, it costs 540 chocolate coins.
• Dastardo Head; You purchase this from Ivor Bargains store, it costs 2,520 chocolate coins.