Old Habits Die Hard

Kill a Ravenii for the first time


These are the giant ogres that try to destroy the city and kill you. Chop off limbs and then scale the back of the beast. Once you are on his shoulders or neck area, hold down the left trigger and chop off his head. You need a full strike meter to chop off heads. Fill your meter by saving civilians, killing jackals and chopping ogre limbs.
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Protector

Save 100 Civilians


Easily attainable while playing the campaign.
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Just a Flesh Wound

Kill a Ravenii while all its limbs are severed


Just behead a giant ogre after you've chopped off both arms and legs. Be quick, you need to kill them before they regenerate their limbs.
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Elite Scourge

Kill 100 Elite Jackals


Large and powerful, they don't show up until you are at Level 5 of the game. You probably won't get this playing the game normally, so once you are done most everything else, just go back and play any level after 5 and keep killing. Probably easiest on Level 7 where your objective is to kill 7 jackals.
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Savior

Save 500 Civilians


See "Protector".
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The Bigger They Are

Kill a Ravenii with a Spiked helmet


You'll encounter this guy in Chapter 6-27 and you'll have to dance around in order for them to knock their own spikes off the armor. You can't sever limbs until they miss attacking you 2 or 3 times with the same limb, which gives you an opportunity to use the Rune Strike. Once you climb their neck or shoulders, you gotta wait until they try to grab you and damage their own helmet. Only then, can you behead them.
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Is it a Bird?

Travel 400 meters without landing


I heard this achievement it's not worked well because personally I was flying for more than 6min (which means 3000m+) and didn't get it, but by more tries I got it without a reason so just keep bouncing on trees or using your whip to swing and you will get it, if not keep trying and trying best place for do that are ''Rescue Trials''
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Slayer

Kill 50 Ravenii


Easily accomplished as you play.
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The Undiscovered Country

Complete Campaign


Run through the story. Stars don't matter, just finishing the level does.
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Master Sentinel

Obtain all possible Stars in Campaign Missions


There are bonus stars for each mission, awarded for map objectives. Take a look at them and focus on them as you play. See the link above, in the Walkthrough for a video on all 3 stars.
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Jackal's Worst Nightmare

Kill 1,000 Jackals


Like "Elite Scourge" you probably won't get this normally. Go grind it out at the end of the game on any map. The earlier levels are ea

Challenger

Finish Daily Challenge 5 times


You can only attempt these once a day. The objectives are random (save civilians, defeat Ravenii, etc...). You need to finish 10 of them (win them) so start doing these immediately and try every day.
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Champion

Finish Daily Challenge 10 times


See "Challenger".
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Bloodthirsty

Complete 10 Extinction Battles


You can start Extinction mode up and just die immediately for 10 quick and easy battles, which will get you an achievement. However, you need to try hard (and do well) in order to get a million points. Points come from kills and civilians saved. Essentially, last as long as you can without dying or without the city being destroyed. The only "tricks" to doing this are:

• Save civilians first and foremost, before they're killed.
  
• Incapacitate the Ravenii but don't kill them, while you save civilians. Once they're all saved or dead, THEN START killing the Ravenii. Once you kill one, they just respawn... so just keep disabling them until you have no other civilians to save.

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Executioner

Earn a score of at least 1,000,000 in Extinction


See "Bloodthirsty".
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Battle-Scarred

Complete 5 Skirmishes


Play random seeds and hope you can finish the scenario. This is a good strategy for learning the game and trying multiple objectives. To get it quickly, just play the same one 10 times. You only need to kill 3 ogres.

1st Ravenii - Wooden armour
2nd Ravenii - Wooden armour and club
3rd Ravenii - Gold armour all over
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Hardened Veteran

Complete 10 Skirmishes


See "Battle-Scarred".
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Completionist

Complete all Rescue Run Trials


DO NOT try this until you've completed the campaign and upgraded your character fully. You need as many of the upgrades as possible. This is one of the toughest achievements in the game and requires you to do a "speed run" of each rescue run. Essentially traveling the map and freeing civilians in various points on the map. The runs are linear and fairly self explanatory, it's just a matter of running, jumping and gliding cleanly and quickly.
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Perfectionist

Obtain 3 Stars in all Rescue Run Trials


See " Completionist".
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Getting Stronger

Purchase 1 Upgrade


You will have more than enough to buy all the upgrades as you play through the game, getting 3 stars and finishing challenges/skirmishes.

I highly suggest you first upgrade the Hasty Portals (speeds up saving civilians) and anything related to the Rune Energy. Don't worry about the jumps, whips or health at the start. Speed and power are more important.
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Hit the Gym

Purchase 15 Upgrades


See "Getting Stronger".
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Eye of the Tiger

Purchase all Upgrades


See "Getting Stronger".
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All That Glitters is Gold

[HIDDEN] Kill a Ravenii wearing Gold Armor


Just use your Rune Strikes to destroy the locks on the armor. Most locks require 2 strikes from your Rune blade in order to break them.
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Undead Armor

[HIDDEN] Kill a Ravenii wearing Bone Armor


Bone armor is indestructible while blowing fire and unfettered. You need to get the Ravenii to miss an attack, which will cause the fire to go out for about 5 seconds. This is the time to attack with a Rune Strike before the fire is lit again.
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A Thorny Situation

[HIDDEN] Kill a Ravenii wearing Thorn Armor


In the middle of each armor piece, there is a smooth area that looks blue. Highlight that with your Rune Strike and hit it twice to destroy it.
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Death Defied

[HIDDEN] Kill a Ravenii wearing Spiked Armor


See "The Bigger They Are".
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Lock and Key

[HIDDEN] Kill a Ravenii wearing Iron Armor


Aim for the padlocks. The key to destroying this (and all Ravenii) is to get close, hold down the Rune Strike to slow time and find the weak spot (the glowing part). Weak spots are always center of the armor or padlocks.
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I Hope you will find this guide helpful~