FU :/
You'll be waiting a week though, I noticed they all had the longest time for them. I've already entered in one, I'll try and go through a bunch more. I know the trophy is bugged though and I suspect there's a very specific circumstance (like being online when the challenges finish or some shit) but Evo are aware and will patch it.
Alright I'm a Kudos King cheers. I have some serious leveling and unlocking to do (joining the level 39 club unlocked 214 items or so haha). What's the difference between ongoing and received challenges? Maybe they move into ongoing from received once you actually try them and post a time/score?