The teaser achievement "History will" was replaced on November 12, 2014, with the Death From Below teaser achievement. The teasers were replaced on November 13, 2014, with the release of the Gage Historical Pack.
Death From Below
be kind to me
to write it
The Death from Below achievement is a play on the phrase "death from above", which refers to the ability of airborne soldiers to cause chaos behind enemy lines.
Special Operations Executive is a reference to the British covert operations organisation of the same name during World War II.
The Winds of Change achievement is a reference to a speech made by Prime Minister Harold MacMillan to the parliament of South Africa in 1960.
So Uncivilized is a reference to a line by Obi-Wan Kenobi from Star Wars Episode III after killing General Grevious with a blaster. Unlocking this achievement requires modding the Broomstick to closely resemble Han Solo's DL-44 blaster pistol from the original Star Wars trilogy.
Bullet Hell is a reference to a genre of 2D shoot-em-ups known as bullet-hell (also danmaku, curtain, or manic) shooters. What sets bullet-hell apart from other shoot-em-up games is the sheer number of projectiles (or bullets) which tend to be on the screen at once.