These objectives include things like keeping all your worms alive for the whole match, defeating enemies with a specific weapon or vehicle, or even finishing the mission without utilizing a certain weapon. (shortpause.com)
I came across a bug that had me stop playing as I could not finish a mission. (blog.us.playstation.com)
This allowed us to finish the mission successfully, after which a ton of loot dropped from the sky. (playstationlifestyle.net)