As soon as you unlock both the Be A Pro Legend card, and the EA Sports Hockey League Legend card, this achievement will unlock. You have to have BOTH legend cards for this achievement. See individual achievement solutions for ways to get both legend cards.
For the EA Sports Hockey League Legend card, use Buckswana's Guide (also posted as a guide for Ea Sports Hockey League Legend achievement) :
Create a game in OTP lobby, and have your friend quickly join. Each take one side and ready up. This will start the game, hopefully before anyone else gets in. One person plays goalie, the other forward. If you're good on the face-off take center, but otherwise take a wing so as not to lose team stats by losing the face off. The forward should try to concentrate on not giving the puck away and position, poke check/hit if possible. The person playing G moves out of the net, allowing the other to score 3 quick goals (2 and 1 assist is ok as well). Once the game hits the 5 minutes played mark and the forward has 3 points, the goalie quits. The forward's stats are boosted, and he gets credit for the win/game played as long as it's after 5 minutes. The other person's goalie stats take a hit, but this doesn't affect their forward. Basically, you're dropping your goalie, but raising your forward, which is all you need. I brought my friend up from B- to A- and his card within about 25 games. This is by far the quickest way I've found to boost stats, and speed up games played as well. Your DNF doesn't seem to track OTP games, as mine still says 4% (which is from Ranked vs. games). 8)
For the Be a Pro Legend card, use CLET8's guide (also posted as a guide for the Be a Pro Legend achievement) :
This is a very time consuming achievement. The following requirements are needed:
- 150 games played with your created Be A Pro player
- An overall rating of A- with this same player
- Win at least 2 trophies (ex: Most goals in a season, Most points)
To get 150 games played, you can simulate 55 minutes of the game, then intervene with 5 minutes left. This will credit you with a game played, as well as A+ if you score a game-winning goal or empty net goal.
Try using no penalties, no line changes, and full shot power and accuracy (Unless your Be A Pro is a goalie) for settings.
For team play: Make good passes, don't turnover the puck, win face-offs, and make big hits.
Remember to follow your arrow for position play, but this shouldn't affect you too much if you're only playing the last 5 minutes anyway.