Yu-Gi-Oh! Legacy of the Duelist

Similar to the other summon achievements, the game provides you with a Synchro Structure deck at the start of the game. This deck might be a little under-powered in some regards, but it is not difficult to get a "Normal" monster and "Tuner" monster on the field at the same time. There are many monsters that allow for multiple summonings in a single turn in order to get the necessary pieces out quickly.

If you find that you are struggling to do this however, consider modifying the deck slightly with the following cards:
-Swords of Revealing Light
-Mirror Force
-Negate Attack

Using these cards should easily allow you to get the parts necessary on the field to eventually get a Synchro Summon onto the field.

NOTE: The tutorial duel where they force a Synchro summon to happen does not count for the achievement.