Here is the full list of all 68 Lethal Laser achievements.
Victory Many Times
Victory With at least 20 life
Victory with only 1 life
Mission Fail Many Times
Destroy Enemy
Escaped Enemy
Highest Wave
Get Resources
Build Tower
Build Reflection Tower
Build Enhancement Tower
Build Split Tower
Build Filter Tower
Build Seperator Tower
Sell Tower
Sell Pre-deployed Tower
Upgrade Tower
Destroy Enemy with White Laser
Destroy Enemy with Red Laser
Burn to Death
Highest Burning Damage
Destroy Enemy with Green Laser
Destroy Enemy with Zero Armor
Destroy Enemy with Blue Laser
Total Slow Time
Highest Slow Rate
Destroy Enemy with Yellow Laser
Highest Critical Damage
Total Critical Damage
Destroy Enemy with Purple Laser
Highest Shield Damage
Total Shield Damage
Destroy Enemy with Cyan Laser
Total Short Circuit
Destroy Enemy with Black Laser
Total Drain Resource
Total Reduce Cooldown
Use Support Command
Destroy Enemy with Command
Destroy Tower with Command
Short Circuit by Command
Use Overdrive
Enemy Alarm Active Time
Get Resource by Alarm
Loss Resource by Alarm
Use Ground Buff
Clear Commander Mode
Total Get Metal
Victory with Difficulty
Pass Highest Difficulty
Total Get Tech Point
Get Most Tech Point Once
Upgrade Tech
Unlock Tech
Reset Tech
Highest Tech Level
Total Get Chip
Get Most Chip Once
Equipped Chip
Destroy Chip
Upgrade Chip
Highest Chip Rarity