What I'm currently doing on 
@union_build
  Testnet

1⃣ Get faucet for Uno, STRD, dydx
http://app.union.build/faucet
(can get as many times as you want)

2⃣ Get faucet for USDC and Arbitrum Sepolia
http://faucet.circle.com
http://faucets.chain.link/arbitrum-sepolia
http://alchemy.com/faucets/arbitrum-sepolia 

3⃣ Send Uno from Union to Sepolia, Holesky, Stargaze, Babylon
http://app.union.build/transfer
(activate your wallet address first by sending Uno to yourself on the wallet)

4⃣ Send Link from Sepolia to Babylon, Stargaze, Union

5⃣ Complete all achievements on http://dashboard.union.build and wait for new ones

PS: the testnet is yet buggy, but for now these go through smoothly