So I went through the achievements and I saw that some names just don't fit, so I came up with replacements.
Also I wanted to squeeze some more jokes in, so pick and choose what you want, if any.
Mortal Combat: The Tournament
Fatality!
(Mortal Kombat!)Chandra, Flamecaller: Chandra's Twister
You didn't just want the achievement did you?
(Name Fitting, Savage Twister)Freyalise, Llanowar's Fury: Freyalise's Force
And all of nature watches...
(Name Fitting, Regal Force)Gideon, Battle-Forged: Gideon's Way Up
No looking back now!
(Name Fitting, No minus ability)Gideon, Ally of Zendikar: Gideon's Anthem
When you do things right, people won't be sure you've done anything at all.
("Cast Gideon, Ult Gideon, Put him in the graveyard...")Jace, Unraveler of Secrets: Jace's Discovery
So, I've read about this neat moonfolk named Erayo...
(Detective at work)Karn Liberated:
Karn's
ResetOnce More with Feeling!
^Liliana, Defiant Necromancer: Liliana's Allure
Come join the Dark Side...
(Name Fitting)Nahiri, the Harbringer: Nahiri's Guest
Who else would it be?
(Name Fitting)Nissa, Sage Animist: Nissa's Calling
You must go! Your people need you!
(Name Fitting)Ob Nixilis of the Black Oath: Nixilis's Oath
To be a reoccurring villain, I will keep watch...
(Name Fitting, Oath of Gideon)Ob Nixilis Reignited: Nixilis's Dreams
I don't think that you will want to think anymore...
(Name Fitting)Sarkhan Vol: Sarkhan's Dragons
They're mean and they're hungry!
(Sarkhan's dragons aren't his minions)Sorin, Grim Nemesis: Sorin's Relatives
You've made a enemy for life!
(Name Fitting)Ugin, the Spirit Dragon: Ugin's Response
I get to call him "Nicol"!
(Name Fitting)