I know I haven't gotten all of the achievements for the game, but the in-game completion is 100%, so I consider it completed, instead of beaten. The remaining two achievements are totally unnecessary for me, so I'm not going to grind the game for another couple hours just to get them.

OPUS started out pretty fun and interesting, but the gaming mechanics got old pretty fast. I did all the side-missions and the extras, so maybe that's why I felt so bored at one point. The story is interesting and I like the execution, but searching for the targets did get tedious after a while. The game helps a bit (I played the normal mode--should've chosen the story one) but even with that, it was boring at parts. I liked the character of Emeth a lot, and his dialogues with Lisa (the AI). I can't recommend the game, but I'm also not saying that it's bad. In the end, I did end up finishing it.