Jonah Lomu Rugby Challenge

This can be done with Lomu All Stars, so best bet is to pick them against someone poor like Germany. You should pretty easily maintain 60% possession, as long as you avoid the most common ways of losing possession:

Kicking the ball away
Running too near the touchline (and getting tackled into touch)
Too many risky offloads while being tackled

Don't be afraid to take the ball into contact and form a ruck, as long as you call enough players in to win the ball. It can be safer than trying a risky offload in tackle, although Lomu All Stars are good enough that you should be able to get away with it.

You can score tries if you want, but bare in mind there is a (low) chance that your opposition will get the ball back after kick off, so if you're having trouble stop scoring.

Or use two controllers, but it's easy enough to do legit.