I know you can obtain route completion badges while riding with a pace partner given the entire route is ridden based on where you joined the pace partner.
That said, with the lead in, Sprinter’s Playground is supposedly about 7.9 miles. I rode 8.1 miles with Maria on 12/12 and 10.7 with her this morning, both on Sprinter’s Playground but still haven’t received the route completion badge - what am I missing? Do I need to complete a certain number of “laps”? Thanks.
You need to pass through the start of the route followed by passing through the finish. So if you join 1m before the start banner, you will get the badge after one lap plus 1m. If you join 1m after the start banner, you will have to do two laps minus 1m to get the badge.
…and nowadays you can see where the pace partner is relative to the start/end point of the route (orange circle, I think gray is the start of the lead-in if you ride it as a normal route on your own) on the map on the sidebar where you join the pace partner:
Thanks @Paul_Southworth and @Anna_Ronkainen - guess I just needed to keep going, third times a charm 
Yeah, the usual advice applies: just keep riding until you get the orange route completed banner at the bottom of your screen.
Reopening an old thread, but I have the same question.
The other day I did 3 full laps of the “Cobbled Climbs” route with Pacer Bernie (the route is 9.2km). On the first two laps I didn’t get any ‘route completed’ banner.
On the third lap I decided to go for a couple of PRs, and got ahead of Bernie. By the time I finished the lap I was no longer getting any drops bonus for riding with Bernie, and only then did I get the route completion banner.
Is there a bug here I wonder? Or can you only get the banner (and the badge) if you’re not with the pacer? Thanks for any advice on this.
Perhaps I should add that I joined Pacer Bernie via Teleporting from Pacer Taylor. I didn’t select the route from the Home Screen.
The issue is still persisting for me on two routes now, Casse-Pattes and Sugar Cookie. Yesterday I decided on joining the robopacer on the Sugar Cookie route and was tracking the Robopacers progress on the Zwift desktop page. I joined just before the junction that goes to Alpe du zwift. I then started the route because I passed through the start line. Next I went on to complete the lap and didn’t get the route completion badge.
The problem is still persisting, i.e. no achievement once I’ve completed a legitimate lap of a new route. Yesterday it happened on Loch Loop and also happened a few times but I didn’t bother writing to Zwift Support about it. It’s a PITA to always write to support when I haven’t got an achievement for completing a new route when i’m on a robo group ride
You know you must complete the route including lead-in?
Example - if you join the pacer when he/she is in the lead-in, you have to ride the lap, cross the lap at the start of lead-in and ride the lap to the end.
I have almost all route badges, zwifting since 2018, had never this issue.
I wasn’t aware that the pacer had to be before lead-in to get the badge, however, in this case, it still doesn’t matter. The lead-in is ~0km on Loch Loop and I started the ride around 2+km from the lead-in
Any chance you are logged in Zwift on more than one device?
You know you must complete the route including lead-in?
That was not my experience on the “Cobbled Climbs” route. See my post above in this thread.
It’s never been a requirement before to complete the whole lead-in to get a badge - just to go through the start banner, do the route with no u-turns and go through the finish banner.
I have reported issue with Sugar Cooke route (please fix link since I can not post links yet): ht tps://forums.zwift.com/t/no-completion-badge-on-route-sugar-cookie/649723
Hello
I completed The Big Ring route today, with Taylor.
Started a few kilometers before lead in, and even after going trought finish banner, i didnt get the badge.
Even when I checked my activity in Strava, its showing, that i started 6,5 km before route start …
Anyone can say, why is that? Thank you.
