Here is the full list of all 70 Zeit² achievements.
Play for at least 2 min and 40 sec in TIME LIMIT MODE
Defeat the stage 4 - level 2 intermediate Boss in under 100 sec
Beat stage 3 level 2 in ARCADE MODE without using TIME TRAVEL PAST
Play through a whole level of SCORE ATTACK MODE stage 3 in FAST FORWARD TIME
Shoot at your time shadow with the BEAM-SHOT and destroy at least 14 enemies that way
Play 2 min in FAST FORWARD TIME
Get 750 CHALLENGE POINTS
Play through the whole ARCADE MODE without dying
Shoot down 250 enemies without letting one escape or crash into you in ARCADE MODE
Complete a randomly chosen level with a specific weapon level.
Use FAST FORWARD TIME scoring more than 150 000 at once
Get 3 platinum medals in TACTICS MODE
Survive in SURVIVAL MODE medium for at least 8 min
Clear any level of SCORE ATTACK MODE without colliding with any enemy
Travel back in time a total of 25 min
Beat any BOSS in under 30 sec
Destroy 15 enemies with a single CHAIN-SHOT
Destroy 15 enemies with a single BEAM-SHOT
Shoot at your time shadow with the BEAM-SHOT and destroy at least 8 enemies that way
Perform a PERFECT TIME TRAVEL with at least 60 000 points
Play through ARCADE MODEPlay through ARCADE MODE
Unlock all WEAPON LEVELS
Play through a whole Level of SCORE ATTACK MODE in FAST FORWARD TIME
Play through a whole level of SCORE ATTACK MODE stage 2 in FAST FORWARD TIME
Travel through time for a total of 30 minutes
Use FAST FORWARD TIME scoring more than 75 000 at once
Use FAST FORWARD TIME scoring more than 30 000 at once
Shoot at your time shadow with the BEAM-SHOT and destroy at least 4 enemies that way
Perform a SHOCKWAVE that blows up at least 20 enemies
Get 250 CHALLENGE POINTS
Beat the stage 1 - level 4 end boss
Perform a PERFECT TIME TRAVEL with at least 30 000 points
Score more than 30 000 points with a single SHOCKWAVE
Perform 50 SHOCKWAVES
Play TIME LIMIT MODE without dying once
Get at least one silver medal in each GAME MODE
Play the game with minimal user-interface setting
Destroy every enemy type at least once
Perform a SHOCKWAVE in under 1 sec
Collect score power-ups worth 1 000 000 points in total
Play each mode at least once
Finish a level in SCORE ATTACK MODE with over 95% destroyed enemies
Perform a SHOCKWAVE
Combine a SHOCKWAVE with a PERFECT TIME TRAVEL
Survive at least 5 min in SURVIVAL MODE
Play through a whole WAVE level without dying
Get a gold medal in WAVE MODE
Travel back in time the maximum of 4.2 seconds
Use TIME TRAVEL PAST scoring more than 15 000 at once
Shoot down 50 enemies without letting one escape or crash into you in ARCADE MODE
Aquire the BEAM-SHOT by defeating the first intermediate boss in ARCADE MODE
Defeat an enemy that hides in spacetime
Perform a PERFECT TIME TRAVEL
Get at least a silver medal in all WAVE MODE levels
Get a platinum medal in all GAME MODES
Complete a whole ARCADE level without shooting a bullet
Get a multiplier of at least 200 in TIME LIMIT MODE
Play a single level of SCORE ATTACK MODE with each of the five weapon levels
Shoot down 400 enemies without letting one escape or crash into you in ARCADE MODE
Perform a PERFECT TIME TRAVEL with at least 120 000 points
Use FAST FORWARD TIME for at least a given percentage of a randomly chosen level.
Get a gold medal in a randomly chosen level with this one try.
Get a hit ratio of over a given percentage in a randomly chosen SCORE ATTACK MODE level.
Play through a randomly chosen SCORE ATTACK MODE level faster than an other player.
Score more points with a single SHOCKWAVE than you ever did before in ARCADE MODE.
Play longer in SURVIVAL MODE than an other player.
Get a medal better than an other player in a randomly chosen level.
Score more points in a randomly chosen level than an other player.
Beat your own high score in a randomly chosen level by a given percentage.
Beat your own high score in a randomly chosen SCORE ATTACK MODE level using a lower WEAPON LEVEL than for your original high score.