As long as you have been completing the quests on https://testnet.movementlabs.xyz/quests, you will be eligible for the airdrop. There were around 350 - 389 quests in total. The number of quests was so damn crazy, but i think it's worthy enough. Sadly, it's passed and waiting for the checker to appear soon.

The airdrop eligibility based on how many quests you have completed it. So, the more quests finished, the bigger reward.