Here is the full list of all 19 Alphadeck achievements.
You won your first duel!
You should try again later!
10 duels? easy!
just 25? that's nothing!
Everyone duels 50 times, come on!
No way you won 100 duels.
You lost 10 times? lol...
You defeated the level 10 enemy, that's easy.
Everyone defeats the level 20, everyone!
You defeated the level 30?
You defeated the level 40? wow!
Please, go back, don't finish the game.
You finished Alphadeck, but did you get all the cards?
You got all the tier 1 cards, that's cool!
All tier 2? easy, now get the tier 3!
The tier 3 cards are really good, ngl!
Now the game starts!
Now make the best deck ever, maybe?
Did you just get all the tier 6 cards? Impossible!