I can't see my completed tasks anywhere on the ipad.
Where should I look?
Unfortunately, this option is currently not available in our mobile apps yet, but we'll consider adding it in future updates and you're welcome to vote for this suggestion in our Votebox: http://todoist.com/Vote_iOS/showProposal/7/
For now, as a workaround, you could try to use the full web-app on your iPad which is HTML5 compatible and should work fine on a mobile browser. To access it, please use this URL: http://todoist.com/m/forceRegular
It's super easy to accidentally swipe a task completed, on the ipad, and then there's no way to fix the mistake from the app....
I would suggest prompting for a confirmation on a swipe, to prevent the accidental completion of tasks....
If you accidentally delete a task, then as long as you stay in the same project, you can scroll to the bottom where you will find it crossed out, tap on it and choose "Uncomplete".