These are achievements that have to do with pokemon you've seen.
Mega Evolution Successor-Collect every Mega capable Pokémon.
Opposite Evolver-Get a mega evolution exclusive to the opposite version.(Example:Mega Charizard Y in X.)
Prehistory n the Making-Have every fossil pokemon.
Flaming kickoff-Obtain every fire starter.
Tidal kickoff-Obtain every water starter.
Nature Kickoff-Obtain Every Grass Starter
Dragon Master-Obtain every Dragon Type pokemon.
Lucky Color-Collect a Shiny Pokémon.
Sparkly...-Obtain 5 Shiny Pokémon.
TOO MANY SPARKLES-Obtain 15 Shiny Pokémon.
Y'ddgrasil Trio-Obtain Xerneas,Yveltal and Zygarde.
Yin,Yang,Yo-Obtain Reshiram,Zekrom and Kyurem.
CREATION POWER-Obtain Dialga,Palkia, And Giratina.
Water,Earth,Air-Obtain Kyogre,Groudon and Rayquaza.
Tower Time-Obtain Ho-Oh and Lugia.
Kenesis killed the Cat-Obtain both Mew and Mewtwo. What up,God?-Obtain Arceus.