Here is a simple Taskwarrior workflow that allows you to view, edit, complete pending and completed items.
Following commands are available:
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t ls - List active tasks
t comp - List completed tasks
t del - List deleted tasks
t wait - List waiting tasks
t recur - List recurring tasks
t add <task text> - Adds new task
Download here: https://github.com/anazimok/taskwarrior-workflow/raw/master/Taskwarrior.alfredworkflow