HELLFRONT: HONEYMOON Achievement Guide

Campaign

• Honeymoon -- Complete the tutorial
  
• Geminus -- Complete all Honeymoon missions
  
• Halcyon IV -- Complete all Geminus missions
  
• Conqueror -- Complete all missions
  
• Commander -- Complete all missions with 1 star
  
• General -- Complete all missions with 2 stars
  
• Overlord -- Complete all missions with 3 stars

Complete all missions with 3 stars. Stars are based on completion time. Two player co-op (local or online) is all but required. According to the in-game leaderboards, only one person has completed the last level solo with 3 stars, while seven have completed it in co-op. Don't mix and match - complete all levels solo or all levels co-op.

Miscellaneous

Other achievements unlockable in the campaign. The maps are only suggestions, and it's possible to unlock all of these elsewhere.

• ORBIT FRAG -- A player is smashed by a falling building

  Map: Honeymoon Mission 001
Squash yourself with any building.

• RAPID EXPANSION -- Build 5 buildings in 3 seconds

  Map: Honeymoon Mission 001
Run over the nearest 5 building sites and spawn buildings on them.

• SQUAD FRAG -- 4 marines are smashed by a falling building

  Map: Honeymoon Mission 002
Build a barracks and wait for 4 marines to spawn. Direct them to the next building site and spawn another building on top of them.

• FRENZY -- 40 aliens spawned in 3 seconds
  
• BUG MASSACRE -- 80 aliens killed by anyone in 8 seconds
  
• MASSIVE DESTRUCTION -- 6 buildings destroyed by anyone in 5 seconds
  
• EXTREME DESTRUCTION -- 12 buildings destroyed by anyone in 10 seconds

  Map: Halcyon Mission 001
With a bit of luck, all of these can happen automatically at the start of the level without needing to do anything.

• DOMINATING -- Destroy 4 buildings and build 1 building in 10 seconds with your team

  Map: Halcyon Mission 001
Instead of doing nothing, build a building and hope your turrets destroy 4 buildings.

Local Deathmatch

I couldn't find a reliable method to unlock these achievements in the campaign, so these are unlocked playing the local deathmatch game mode. They require 1-3 controllers to unlock.

• GOING BERZERK -- Destroy 5 buildings in 5 seconds with your player

  Map: Honeymoon Deathmatch 011
This can be done with a controller (and keyboard). Build 5 barracks in one corner of the map and send all the marines to a different corner. Use the other player to destroy the buildings. Whittle down each one first.

• RAMPAGE -- Kill 4 players with your player without dying

  Map: Honeymoon Deathmatch 011
This can also be done with a controller (and keyboard). Build a barracks on one side of the map, then walk to the other player to let them kill you. Repeat 4 times.

• DOUBLE KILL -- Kill 2 players with your player in 5 seconds
  
• TRIPLE KILL -- Kill 3 players with your player in 10 seconds

  Map: Halcyon Deathmatch 001
Can easily be done with 3 controllers (and keyboard). Walk everyone together and remember to whittle down each player first.

• MAYHEM -- 55 marines killed by anyone in 3 seconds
  
• SLAUGHTER -- 55 marines and 1 building destroyed by anyone in 6 seconds

  Map: Halcyon Deathmatch 020
I did these with 3 controllers (and keyboard). Set up the map as shown in the video, hide marines in the corners, then send everything to the middle of the map simultaneously and hope they unlock.

Online PvP

• Iron Champion -- Win 10 PvP Matches
  
• Silver Champion -- Win 10 PvP Matches against Silver League opponents or higher
  
• Gold Champion -- Win 10 PvP Matches against Gold League opponents or higher
  
• Diamond Champion -- Win 10 PvP Matches against Diamond League opponents

The easiest way to do all these is to trade wins with a partner. 'League' refers to the skill rating of your opponent. Diamond League is 25K+. I was gold after my first match/win. These achievements never stack regardless of your opponent's skill rating, and you'll always only get progress towards them in this order: Iron > Silver > Gold > Diamond.