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This solution will work perfectly for the Challenger and Challenge Wizard achievements.

While online on the Community Challenges section simply pick a challenge with a red cog in the left corner (you can pick one with a tree or lightbulb but those are not needed for the achievement)

Simply complete 10 of these and the achievement will be yours. It is as simple as that.

Note: You cannot repeat the same challenge 10 times, I tried and it dosen't work.